FAQ :: Mishradews

some important question asked at the time of interview.(c,c++,advance java,operating system)

C- Questions

What does static variable mean?
What is a pointer?
What is a structure?
What are the differences between structures and arrays?
In header files whether functions are declared or defined?
What are the differences between malloc() and calloc()?
What are macros? what are its advantages and disadvantages?
Difference between pass by reference and pass by value?
What is static identifier?
Where are the auto variables stored?
Where does global, static, local, register variables, free memory and C Program instructions get stored?
Difference between arrays and linked list?
What are enumerations?
Describe about storage allocation and scope of global, extern, static, local and register variables?
What are register variables? What are the advantage of using register variables?
What is the use of typedef?
Can we specify variable field width in a scanf() format string? If possible how?
Out of fgets() and gets() which function is safe to use and why?
Difference between strdup and strcpy?
What is recursion?
Differentiate between a for loop and a while loop? What are it uses?
What are the different storage classes in C?
Write down the equivalent pointer expression for referring the same element a[i][j][k][l]?
What is difference between Structure and Unions?
What the advantages of using Unions?
What are the advantages of using pointers in a program?
What is the difference between Strings and Arrays?
In a header file whether functions are declared or defined?
What is a far pointer? where we use it?
How will you declare an array of three function pointers where each function receives two ints and returns a float?
what is a NULL Pointer? Whether it is same as an uninitialized pointer?
What is a NULL Macro? What is the difference between a NULL Pointer and a NULL Macro?
What does the error 'Null Pointer Assignment' mean and what causes this error?
What is near, far and huge pointers? How many bytes are occupied by them?
How would you obtain segment and offset addresses from a far address of a memory location?
Are the expressions arr and &arr same for an array of integers?
Does mentioning the array name gives the base address in all the contexts?
Explain one method to process an entire string as one unit?
What is the similarity between a Structure, Union and enumeration?
Can a Structure contain a Pointer to itself?
How can we check whether the contents of two structure variables are same or not?
How are Structure passing and returning implemented by the complier?
How can we read/write Structures from/to data files?
What is the difference between an enumeration and a set of pre-processor # defines?
what do the 'c' and 'v' in argc and argv stand for?
Are the variables argc and argv are local to main?
What is the maximum combined length of command line arguments including the space between adjacent arguments?
If we want that any wildcard characters in the command line arguments should be appropriately expanded, are we required to make any special provision? If yes, which?
Does there exist any way to make the command line arguments available to other functions without passing them as arguments to the function?
What are bit fields? What is the use of bit fields in a Structure declaration?
To which numbering system can the binary number 1101100100111100 be easily converted to?
Which bit wise operator is suitable for checking whether a particular bit is on or off?
Which bit wise operator is suitable for turning off a particular bit in a number?
Which bit wise operator is suitable for putting on a particular bit in a number?
Which bit wise operator is suitable for checking whether a particular bit is on or off?
which one is equivalent to multiplying by 2:Left shifting a number by 1 or Left shifting an unsigned int or char by 1?
Write a program to compare two strings without using the strcmp() function.
Write a program to concatenate two strings.
Write a program to interchange 2 variables without using the third one.
Write programs for String Reversal & Palindrome check
Write a program to find the Factorial of a number
Write a program to generate the Fibinocci Series
Write a program which employs Recursion
Write a program which uses Command Line Arguments
Write a program which uses functions like strcmp(), strcpy()? etc
What are the advantages of using typedef in a program?
How would you dynamically allocate a one-dimensional and two-dimensional array of integers?
How can you increase the size of a dynamically allocated array?
How can you increase the size of a statically allocated array?
When reallocating memory if any other pointers point into the same piece of memory do you have to readjust these other pointers or do they get readjusted automatically?
Which function should be used to free the memory allocated by calloc()?
How much maximum can you allocate in a single call to malloc()?
Can you dynamically allocate arrays in expanded memory?
What is object file? How can you access object file?
Which header file should you include if you are to develop a function which can accept variable number of arguments?
Can you write a function similar to printf()?
How can a called function determine the number of arguments that have been passed to it?
Can there be at least some solution to determine the number of arguments passed to a variable argument list function?
How do you declare the following:
An array of three pointers to chars
An array of three char pointers
A pointer to array of three chars
A pointer to function which receives an int pointer and returns a float pointer
A pointer to a function which receives nothing and returns nothing
What do the functions atoi(), itoa() and gcvt() do?
Does there exist any other function which can be used to convert an integer or a float to a string?
How would you use qsort() function to sort an array of structures?
How would you use qsort() function to sort the name stored in an array of pointers to string?
How would you use bsearch() function to search a name stored in array of pointers to string?
How would you use the functions sin(), pow(), sqrt()?
How would you use the functions memcpy(), memset(), memmove()?
How would you use the functions fseek(), freed(), fwrite() and ftell()?
How would you obtain the current time and difference between two times?
How would you use the functions randomize() and random()?
How would you implement a substr() function that extracts a sub string from a given string?
What is the difference between the functions rand(), random(), srand() and randomize()?
What is the difference between the functions memmove() and memcpy()?
How do you print a string on the printer?
Can you use the function fprintf() to display the output on the screen?

C++ QUESTIONS

What is a class?
What is an object?
What is the difference between an object and a class?
What is the difference between class and structure?
What is public, protected, private?
What are virtual functions?
What is friend function?
What is a scope resolution operator?
What do you mean by inheritance?
What is abstraction?
What is polymorphism? Explain with an example.
What is encapsulation?
What do you mean by binding of data and functions?
What is function overloading and operator overloading?
What is virtual class and friend class?
What do you mean by inline function?
What do you mean by public, private, protected and friendly?
When is an object created and what is its lifetime?
What do you mean by multiple inheritance and multilevel inheritance? Differentiate between them.
Difference between realloc() and free?
What is a template?
What are the main differences between procedure oriented languages and object oriented languages?
What is R T T I ?
What are generic functions and generic classes?
What is namespace?
What is the difference between pass by reference and pass by value?
Why do we use virtual functions?
What do you mean by pure virtual functions?
What are virtual classes?
Does c++ support multilevel and multiple inheritance?
What are the advantages of inheritance?
When is a memory allocated to a class?
What is the difference between declaration and definition?
What is virtual constructors/destructors?
In c++ there is only virtual destructors, no constructors. Why?
What is late bound function call and early bound function call? Differentiate.
How is exception handling carried out in c++?
When will a constructor executed?
What is Dynamic Polymorphism?
Write a macro for swapping integers.

DATA STRUCTURE QUESTIONS

What is a data structure?
What does abstract data type means?
Evaluate the following prefix expression " ++ 26 + - 1324" (Similar types can be asked)
Convert the following infix expression to post fix notation ((a+2)*(b+4)) -1 (Similar types can be asked)
How is it possible to insert different type of elements in stack?
Stack can be described as a pointer. Explain.
Write a Binary Search program
Write programs for Bubble Sort, Quick sort
Explain about the types of linked lists
How would you sort a linked list?
Write the programs for Linked List (Insertion and Deletion) operations
What data structure would you mostly likely see in a non recursive implementation of a recursive algorithm?
What do you mean by Base case, Recursive case, Binding Time, Run-Time Stack and Tail Recursion?
Explain quick sort and merge sort algorithms and derive the time-constraint relation for these.
Explain binary searching, Fibinocci search.
What is the maximum total number of nodes in a tree that has N levels? Note that the root is level (zero)
How many different binary trees and binary search trees can be made from three nodes that contain the key values 1, 2 & 3?
A list is ordered from smaller to largest when a sort is called. Which sort would take the longest time to execute?
A list is ordered from smaller to largest when a sort is called. Which sort would take the shortest time to execute?
When will you sort an array of pointers to list elements, rather than sorting the elements themselves?
The element being searched for is not found in an array of 100 elements. What is the average number of comparisons needed in a sequential search to determine that the element is not there, if the elements are completely unordered?
What is the average number of comparisons needed in a sequential search to determine the position of an element in an array of 100 elements, if the elements are ordered from largest to smallest?
Which sort show the best average behavior?
What is the average number of comparisons in a sequential search?
Which data structure is needed to convert infix notations to post fix notations?
What do you mean by:
Syntax Error
Logical Error
Runtime Error
How can you correct these errors?
In which data structure, elements can be added or removed at either end, but not in the middle?
How will inorder, preorder and postorder traversals print the elements of a tree?
Parenthesis are never needed in prefix or postfix expressions. Why?
Which one is faster? A binary search of an orderd set of elements in an array or a sequential search of the elements.

JAVA QUESTIONS

What is the difference between an Abstract class and Interface?
What is user defined exception?
What do you know about the garbage collector?
What is the difference between java and c++?
In an HTML form I have a button which makes us to open another page in 15 seconds. How will you do that?
What is the difference between process and threads?
What is update method called?
Have you ever used HashTable and Directory?
What are statements in Java?
What is a JAR file?
What is JNI?
What is the base class for all swing components?
What is JFC?
What is the difference between AWT and Swing?
Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times ? Where three processes are started or three threads are started?
How does thread synchronization occur in a monitor?
Is there any tag in HTML to upload and download files?
Why do you canvas?
How can you know about drivers and database information ?
What is serialization?
Can you load the server object dynamically? If so what are the 3 major steps involved in it?
What is the layout for toolbar?
What is the difference between Grid and Gridbaglayout?
How will you add panel to a frame?
Where are the card layouts used?
What is the corresponding layout for card in swing?
What is light weight component?
Can you run the product development on all operating systems?
What are the benefits if Swing over AWT?
How can two threads be made to communicate with each other?
What are the files generated after using IDL to java compiler?
What is the protocol used by server and client?
What is the functionability stubs and skeletons?
What is the mapping mechanism used by java to identify IDL language?
What is serializable interface?
What is the use of interface?
Why is java not fully objective oriented?
Why does java not support multiple inheritance?
What is the root class for all java classes?
What is polymorphism?
Suppose if we have a variable 'I' in run method, if I can create one or more thread each thread will occupy a separate copy or same variable will be shared?
What are virtual functions?
Write down how will you create a Binary tree?
What are the traverses in binary tree?
Write a program for recursive traverse?
What are session variable in servlets?
What is client server computing?
What is constructor and virtual function? Can we call a virtual function in a constructor?
Why do we use oops concepts? What is its advantage?
What is middleware? What is the functionality of web server?
Why is java not 100% pure oops?
When will you use an interface and abstract class?
What is the exact difference in between Unicast and Multicast object? Where will it be used?
What is the main functionality of the remote reference layer?
How do you download stubs from Remote place?
I want to store more than 10 objects in a remote server? Which methodology will follow?
What is the main functionality of Prepared Statement?
What is meant by Static query and Dynamic query?
What are Normalization Rules? Define Normalization?
What is meant by Servelet? What are the parameters of service method?
What is meant by Session? Explain something about HTTP Session Class?
In a container there are 5 components. I want to display all the component names, how will you do that?
Why there are some null interface in JAVA? What does it mean? Give some null interface in JAVA?
Tell some latest versions in JAVA related areas?
What is meant by class loader? How many types are there? When will we use them?
What is meant by flickering?
What is meant by distributed application? Why are we using that in our application?
What is the functionality of the stub?
Explain about version control?
Explain 2-tier and 3-tier architecture?
What is the role of Web Server?
How can we do validation of the fields in a project?
What is meant by cookies? Explain the main features?
Why java is considered as platform independent?
What are the advantages of java over C++?
How java can be connected to a database?
What is thread?
What is difference between Process and Thread?
Does java support multiple inheritance? if not, what is the solution?
What are abstract classes?
What is an interface?
What is the difference abstract class and interface?
What are adapter classes?
what is meant wrapper classes?
What are JVM.JRE, J2EE, JNI?
What are swing components?
What do you mean by light weight and heavy weight components?
What is meant by function overloading and function overriding?
Does java support function overloading, pointers, structures, unions or linked lists?
What do you mean by multithreading?
What are byte codes?
What are streams?
What is user defined exception?
In an HTML page form I have one button which makes us to open a new page in 15 seconds. How will you do that?

Advanced JAVA questions

What is RMI?
Explain about RMI Architecture?
What are Servelets?
What is the use of servlets?
Explain RMI Architecture?
How will you pass values from HTML page to the servlet?
How do you load an image in a Servelet?
What is purpose of applet programming?
How will you communicate between two applets?
What IS the difference between Servelets and Applets?
How do you communicate in between Applets and Servlets?
What is the difference between applet and application?
What is the difference between CGI and Servlet?
In the servlets, we are having a web page that is invoking servlets ,username and password? which is checks in database? Suppose the second page also if we want to verify the same information whether it will connect to the database or it will be used previous information?
What are the difference between RMI and Servelets?
How will you call an Applet using Java Script Function?
How can you push data from an Applet to a Servlet?
What are 4 drivers available in JDBC? At what situation are four of the drivers used?
If you are truncated using JDBC , how can you that how much data is truncated?
How will you perform truncation using JDBC?
What is the latest version of JDBC? What are the new features added in that?
What is the difference between RMI registry and OS Agent? To a server method, the client wants to send a value 20, with this value exceeds to 20 a message should be sent to the client . What will you do for achieving this?
How do you invoke a Servelet? What is the difference between doPost method and doGet method?
What is difference between the HTTP Servelet and Generic Servelet? Explain about their methods and parameters?
Can we use threads in Servelets?
Write a program on RMI and JDBC using Stored Procedure?
How do you swing an applet?
How will you pass parameters in RMI? Why do you serialize?
In RMI ,server object is first loaded into memory and then the stub reference is sent to the client. true or false?
Suppose server object not loaded into the memory and the client request for it. What will happen?
What is the web server used for running the servelets?
What is Servlet API used for connecting database?
What is bean? Where can it be used?
What is the difference between java class and bean?
Can we sent objects using Sockets?
What is the RMI and Socket?
What is CORBA?
Can you modify an object in corba?
What is RMI and what are the services in RMI?
What are the difference between RMI and CORBA?
How will you initialize an Applet?
What is the order of method invocation in an Applet?
What is ODBC and JDBC? How do you connect the Database?
What do you mean by Socket Programming?
What is difference between Generic Servlet and HTTP Servelet?
What you mean by COM and DCOM?
what is e-commerce?

Operating System Questions

What are the basic functions of an operating system?
Explain briefly about, processor, assembler, compiler, loader, linker and the functions executed by them.
What are the difference phases of software development? Explain briefly?
Differentiate between RAM and ROM?
What is DRAM? In which form does it store data?
What is cache memory?
What is hard disk and what is its purpose?
Differentiate between Complier and Interpreter?
What are the different tasks of Lexical analysis?
What are the different functions of Syntax phase, Sheduler?
What are the main difference between Micro-Controller and Micro- Processor?
Describe different job scheduling in operating systems.
What is a Real-Time System ?
What is the difference between Hard and Soft real-time systems ?
What is a mission critical system ?
What is the important aspect of a real-time system ?
If two processes which shares same system memory and system clock in a distributed system, What is it called?
What is the state of the processor, when a process is waiting for some event to occur?
What do you mean by deadlock?
Explain the difference between microkernel and macro kernel.
Give an example of microkernel.
When would you choose bottom up methodology?
When would you choose top down methodology?
Write a small dc shell script to find number of FF in the design.
Why paging is used ?
Which is the best page replacement algorithm and Why? How much time is spent usually in each phases and why?
Difference between Primary storage and secondary storage?
What is multi tasking, multi programming, multi threading?
Difference between multi threading and multi tasking?
What is software life cycle?
Demand paging, page faults, replacement algorithms, thrashing, etc.
Explain about paged segmentation and segment paging
While running DOS on a PC, which command would be used to duplicate the entire diskette?

MICROPROCESSOR QUESTIONS

Which type of architecture 8085 has?
How many memory locations can be addressed by a microprocessor with 14 address lines?
8085 is how many bit microprocessor?
Why is data bus bi-directional?
What is the function of accumulator?
What is flag, bus?
What are tri-state devices and why they are essential in a bus oriented system?
Why are program counter and stack pointer 16-bit registers?
What does it mean by embedded system?
What are the different addressing modes in 8085?
What is the difference between MOV and MVI?
What are the functions of RIM, SIM, IN?
What is the immediate addressing mode?
What are the different flags in 8085?
What happens during DMA transfer?
What do you mean by wait state? What is its need?
What is PSW?
What is ALE? Explain the functions of ALE in 8085.
What is a program counter? What is its use?
What is an interrupt?
Which line will be activated when an output device require attention from CPU?

ELECTRONICS QUESTIONS

What is meant by D-FF?
What is the basic difference between Latches and Flip flops?
What is a multiplexer?
How can you convert an SR Flip-flop to a JK Flip-flop?
How can you convert an JK Flip-flop to a D Flip-flop?
What is Race-around problem? How can you rectify it?
Which semiconductor device is used as a voltage regulator and why?
What do you mean by an ideal voltage source?
What do you mean by zener breakdown and avalanche breakdown?
What are the different types of filters?
What is the need of filtering ideal response of filters and actual response of filters?
What is sampling theorem?
What is impulse response?
Explain the advantages and disadvantages of FIR filters compared to IIR counterparts.
What is CMRR? Explain briefly.
What do you mean by half-duplex and full-duplex communication? Explain briefly.
Which range of signals are used for terrestrial transmission?
What is the need for modulation?
Which type of modulation is used in TV transmission?
Why we use vestigial side band (VSB-C3F) transmission for picture?
When transmitting digital signals is it necessary to transmit some harmonics in addition to fundamental frequency?
For asynchronous transmission, is it necessary to supply some synchronizing pulses additionally or to supply or to supply start and stop bit?
BPFSK is more efficient than BFSK in presence of noise. Why?
What is meant by pre-emphasis and de-emphasis?
What do you mean by 3 dB cutoff frequency? Why is it 3 dB, not 1 dB?
What do you mean by ASCII, EBCDIC?

Circular Queues in C using 'count' as a variable to keep track of no. of elements in a queue?

#include
#include
#include
#define MAX 10

typedef int qelement;

typedef struct
{
qelement q[MAX];
int left,right,count;
}qtype;

void initialise(qtype *qptr)
{ qptr->left = qptr->right = qptr->count = 0;
}

int add_left(qtype *qptr, qelement no)
{
if(qptr->count == MAX) return 0; // Queue is full

qptr->q[qptr->left] = no;

if(qptr->left == 0)
qptr->left = MAX;
else
qptr->left --;

qptr->count ++;
return 1;

}

int add_right(qtype *qptr, qelement no)
{
if(qptr->count == MAX) return 0; // Queue is full

if(qptr->right == MAX)
qptr->right = 0;
else
qptr->right ++;

qptr->q[qptr->right] = no;

qptr->count ++;
return 1;

}

int delete_left(qtype *qptr, qelement *noptr)
{
if(qptr->count==0) return 0; //Queue is empty

if(qptr->left == MAX)
qptr->left == 0;
else
qptr->left ++;

*noptr = qptr->q[qptr->left];

qptr->count --;
return 1;
}

int delete_right(qtype *qptr, qelement *noptr)
{
if(qptr->count == 0) return 0;

*noptr = qptr->[qptr->right];

if(qptr->right == 0)
qptr->right = MAX;
else
qptr->right --;

qptr->count --;
return 1;

}

void printq(qtype qt)
{
int i;

if(qt.count == 0)
printf("Queue is Empty");
else
{
printf("The current Queue is :\n");
if(qt.right <= qt.left)
{
for(i = qt.left +1; i < MAX; i++)
printf("%d ",qt.q[i]);
for(i = 0; i <= qt.right; i++)
printf("%d",qt.q[i]);

}
else
for(i = qt.left + 1; i <= qt.right; i++)
printf("%d",qt.q[i]);
}
getch();
}

void main()
{
qtype qt;
qelement no;
int i, choice;

initialise(&qt);

do {
clrscr();

printf("Press :\n1-Add left\n2-Add right\n3-Delete left\n4-Delete right");
printf("Enter your choice : ");
scanf("%d",&choice);

switch(choice)
{
case 1: printf("Enter the no. to be added to right of queue : ");
scanf("%d",&no);
if(!add_right(&qt,no))
printf("Cannot add");
printq(qt);
break;

case 2: printf("Enter the no. to be added to left of queue : ");
scanf("%d",&no);
if(!add_left(&qt,no))
printf("Cannot add\n");
printq(qt);
break;

case 3: if(!delete_right(&qt,&no))
printf("Cannot delete\n");
else
printf("The no. deleted from right of queue is %d\n",no);
printq(qt);
break;

case 4: if(!delete_left(&qt,&no))
printf("Cannot delete\n");
else
printf("The no. deleted from left of queue is %d\n",no);
printq(qt);
break;

}

} while (choice != 5)

}

A "C" in unix which creates an server and client environment?

#include
#include
#include
#include
#include

void error(char *msg)
{
perror(msg);
exit(0);
}

int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;

char buffer[256];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
return 0;
}

/*Server */

#include
#include
#include
#include

void error(char *msg)
{
perror(msg);
exit(1);
}

int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, clilen;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
int n;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr,
&clilen);
if (newsockfd < 0)
error("ERROR on accept");
bzero(buffer,256);
n = read(newsockfd,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
n = write(newsockfd,"I got your message",18);
if (n < 0) error("ERROR writing to socket");
return 0;
}

sample question asked by tcs in an interview in 2011,bangalore

TCS questions:

1what is your rating in java technology(range 1-5)?

2what is your rating in corejava/jsp/struts/hibernate/spring/oracle(range 1-5)?

3what are the diff declarative tags in jsp?

4how you set the session max interval time?

5what is the jsp life cycle?

6what is the diff betn jsp:include and jsp:forward?

7what is the send redirect?

8what is the diff betn hashmap and hashtable?

9what is the diff betn set and list?

10in which scenario you used ThreadLocal obj in your pjt?

11what is the thread life cycle?

12 how you handle the lookup tables?

13how you handle the exceptions?

14what is the diff betn checked and unchecked exceptions?

15if I have an scenario like declaring Arithematic functions in jsp which tags u preferred?

16I have two java script functions with parameters how will I get that parameters list?

17how do you perform the front-end validations by using java script?

18oracle joins & co-related sub queries:

19what r the diff validations in struts framework?

20hibernate relations ships? – Table Names…. – One-to-One

21dif types of ejbs?

22explain slsb,sfsb,cmp,bmp,mdb in EJB?

23can we create the SessionFactory obj with out using hibernate configuration file?

24what r the diff controllers we have in spring mvc?

25 can we have more properties in pojo than the no.of. columns in db table(true/false)?

26explain xml 7 types of parsers?

27what do you mean by connection pool?

28explain ejb transactions?

29if there r two threads trying to access synchronized method and while 1^st thread being processed exception came . in this case what about 2^nd thread?

30how can we get the implicit object “exception” in jsp?

31diff betn load/get?

32struts flow?

33about struts validatior plugin?

34how to get only particular record without loading whole object by using Hibernate framework?

PROJECT ROUND

1 what is your project phase?

2what is your role In your pjt?

3what r the diff design patterns(dp) u used in pjt?

4what is the diff betn mvc1 and mvc2?

5once you develop the code what will you do?

6did u give any support to product support team?

7in pjt what other features u were added?

8what is the diff betn tickets and defects?

9how u integrate struts with spring?

10what meant by server monitoring?

Sample question asked at various company interview like wipro,ibm,mind tree,bob technologies,marlabs etc........

1. Wipro Technologies
##################

overloading and overriding example?
Diff. b/w Hashtable and Hashmap?
Diff. b/w Vector and ArrayList?
Why we will give preference to ArrayList?
where we used in vector?
What is Thin? Diff. b/w Thin and Thick?
How the JspSession Management will done program?
How the JDBCConnection will be Produced Program?
If it possibe multiple constructors in the same class
means different parameters.
How can we call with in the same class? Ans: this

How the Jsp Form Fields will be submitted.
if any error will occur the data fields will be lost
or any where stored? Ans: Bean Or Session
Where the field validation will be done?
Ans: Form Bean
what is DesignPattern? what are the types of design
patterns?
what is the SingleTon DesignPattern?

2. IBM Technologies
################

what is the Diff. b/w Servlets and Jsp?
what are the implicit objects in jsp?
what is the diff. b/w Forward and Include?
what is the diff.b/w JspDirective[<%@JspInclude%>] tag and Jsp:include[<jsp:include>] tag?
Diff. b/w Hashtable and Hashmap?
How many types of Ejb?
Which is the best performance of interface and abstract?
what is the JspLifecycle?

3. Capgemini
#########
Diff. b/w Abstract and Interface?
what is the diff. b/w Jsp:forward tag and rd.forward(".jsp")?
what is the diff. b/w <jsp:include> and <%@JspInclude%> ?
how can we handle the Exceptions in Jsp?
what are the weblogic[7001], tomcat[8080]
websphere[9080] port no?
what is the Latest version of java?
what is Wrapper classes?
final,finally and finalized?
about on ArrayList?
Diff. b/w Hashtable and Hashmap?
Servlet Lifecycle?
tell me about on Custom tag files?
what are the Struts Action classes?
how to use the Cuistom tags in the Struts?
we don't know the which type of collection object will come at Runtime. then it will be take a method to one element and compare and sort that element how can we proceed?
Ans: ArrayList,Vectors,LinkedList,Set?

weblogic:
how the cluster will be done?
how the session Pool settings are done in weblogic?
how Replication done in weblogic server?
how will you write replication code for weblogic in j2ee?
how it user enter 3 fields. if server goes down then what happend?
if 1000 users access the same page at a time in that case what will happend?
write struts validation through programmatic and xml validation?

CVS:
if one user modified content and another user also modified. first user modified if the second user save it what happend?
First change and submit and second user change what happend? First change and submit and second user not chagged then what happend. what file he get?
First will save, Second not saved and not chan ged. if the third user will access what happend?
one to many mapping hbm files? Eg: Employee ------> projects
100
Jbuilder version?
In Eclipse how to PlugIn CVS or SVN?
Name:------
     ------
Attachments
-----------
-----------
   submit
here Btmp files are not allowed and Zip files are allowed? then how to get it errors will be raised?
4. MindTree:
##########
write a program for CRUD Operations using Struts Action calass,design patterns and handle the exceptions? and use all the layers in struts?
what is the servlet?
how to handle exception?
diff. b/w Abstract class and interface?
diff. b/w vector and Arrayist?
what are the abstract class and interfaces?
what is servlet lifecycle?
what is diff. b/w voltaile and Transient?
what is Ejb?
what is the role of Action class in struts?
what is Home interface and Remote interface?
how to validate a FormBean?
what is the method present in Home interface?

5. BOB Technologies:
#################

what is the diff. b/w JRE, JVM,JDK?
SingleTon designPattern Example?
Factory design Pattern?
what is the use of Spring?
how can you write the Userdefined Exceptions?
what are the diff. b/w iterator and Enumerator?
what are the diff. b/w HashMap and HashTable?
HashMap is taken key value as null?
it is possible to take two times key value as null. what will happend?
what is the JspLifeCycle?
how can we careat Session object?
beroree class we can daclare specifiers as sataic? how and what?
what is overriding and oiverloading?
In super class protected is there is iyt possible to override with the public specifier?
how can u write with out using catch block?
how can u write using try and finally ?
what is the diff. b/w throws and throw keywords?
what is the purpose of finally block?
what is abstraction?
what is the diff b/w string,StringBuffer & Stringbulider?
What is the connection pool purpose?

User Request -----> SERVLET   Howmany objects are created? Is it possible multithreading?
    100

6. MarLabs Software Pvt.Ltd:
#########################

where the static variables will be stored?
where the instyle variables will be stored?
what are the class loaders in java?
Diff. b/w instance variable and static variable?
what is synchronization? give the example?
How to prevent multithreading in jsp?
what are the JspLifeCycle?
Diff. b/w ArrayList and Vector?
How to convert ArrayList as Synchronized?
Diff. b/w Hashtable and Hashmap?
what are the diff. b/w iterator and Enumerator?
what is the diff b/w StringBuffer & Stringbulider?
what is log4j?
what are the levels of log4j?
what are the types of Appenders in log4j?
How to Build the Ant tool?
Explain the struts flow?
Explain the validate() in struts?
what is the Reflection in java?
Method Overriding in Exception case?
What is the diff. b/w interface and abstract class?
what is the NumberFormatException?
How to show the Exceptions in Jsp?
What is the Singleton Design Pattern?
How to manage the Session object?
Diff. b/w Servlet Outext and Servlet Outing?
Haow to create the Session object in Hibernate?
Diff. b/w Webserver and Application server?
To create the SessionFactory object what will happend?
How to get the particular key value in HashMap?
What is Serialization?
Give the example of Serialization? Which are not serializable and Which are not serializable?

1. Wipro Technologies
##################

overloading and overriding example?
Diff. b/w Hashtable and Hashmap?
Diff. b/w Vector and ArrayList?
Why we will give preference to ArrayList?
where we used in vector?
What is Thin? Diff. b/w Thin and Thick?
How the JspSession Management will done program?
How the JDBCConnection will be Produced Program?
If it possibe multiple constructors in the same class
means different parameters.
How can we call with in the same class? Ans: this

How the Jsp Form Fields will be submitted.
if any error will occur the data fields will be lost
or any where stored? Ans: Bean Or Session
Where the field validation will be done?
Ans: Form Bean
what is DesignPattern? what are the types of design
patterns?
what is the SingleTon DesignPattern?

2. IBM Technologies
################

what is the Diff. b/w Servlets and Jsp?
what are the implicit objects in jsp?
what is the diff. b/w Forward and Include?
what is the diff.b/w JspDirective[<%@JspInclude%>] tag and Jsp:include[<jsp:include>] tag?
Diff. b/w Hashtable and Hashmap?
How many types of Ejb?
Which is the best performance of interface and abstract?
what is the JspLifecycle?

3. Capgemini
#########
Diff. b/w Abstract and Interface?
what is the diff. b/w Jsp:forward tag and rd.forward(".jsp")?
what is the diff. b/w <jsp:include> and <%@JspInclude%> ?
how can we handle the Exceptions in Jsp?
what are the weblogic[7001], tomcat[8080]
websphere[9080] port no?
what is the Latest version of java?
what is Wrapper classes?
final,finally and finalized?
about on ArrayList?
Diff. b/w Hashtable and Hashmap?
Servlet Lifecycle?
tell me about on Custom tag files?
what are the Struts Action classes?
how to use the Cuistom tags in the Struts?
we don't know the which type of collection object will come at Runtime. then it will be take a method to one element and compare and sort that element how can we proceed?
Ans: ArrayList,Vectors,LinkedList,Set?

weblogic:
how the cluster will be done?
how the session Pool settings are done in weblogic?
how Replication done in weblogic server?
how will you write replication code for weblogic in j2ee?
how it user enter 3 fields. if server goes down then what happend?
if 1000 users access the same page at a time in that case what will happend?
write struts validation through programmatic and xml validation?

CVS:
if one user modified content and another user also modified. first user modified if the second user save it what happend?
First change and submit and second user change what happend? First change and submit and second user not chagged then what happend. what file he get?
First will save, Second not saved and not chan ged. if the third user will access what happend?
one to many mapping hbm files? Eg: Employee ------> projects
100
Jbuilder version?
In Eclipse how to PlugIn CVS or SVN?
Name:------
     ------
Attachments
-----------
-----------
   submit
here Btmp files are not allowed and Zip files are allowed? then how to get it errors will be raised?
4. MindTree:
##########
write a program for CRUD Operations using Struts Action calass,design patterns and handle the exceptions? and use all the layers in struts?
what is the servlet?
how to handle exception?
diff. b/w Abstract class and interface?
diff. b/w vector and Arrayist?
what are the abstract class and interfaces?
what is servlet lifecycle?
what is diff. b/w voltaile and Transient?
what is Ejb?
what is the role of Action class in struts?
what is Home interface and Remote interface?
how to validate a FormBean?
what is the method present in Home interface?

5. BOB Technologies:
#################

what is the diff. b/w JRE, JVM,JDK?
SingleTon designPattern Example?
Factory design Pattern?
what is the use of Spring?
how can you write the Userdefined Exceptions?
what are the diff. b/w iterator and Enumerator?
what are the diff. b/w HashMap and HashTable?
HashMap is taken key value as null?
it is possible to take two times key value as null. what will happend?
what is the JspLifeCycle?
how can we careat Session object?
beroree class we can daclare specifiers as sataic? how and what?
what is overriding and oiverloading?
In super class protected is there is iyt possible to override with the public specifier?
how can u write with out using catch block?
how can u write using try and finally ?
what is the diff. b/w throws and throw keywords?
what is the purpose of finally block?
what is abstraction?
what is the diff b/w string,StringBuffer & Stringbulider?
What is the connection pool purpose?

User Request -----> SERVLET   Howmany objects are created? Is it possible multithreading?
    100

6. MarLabs Software Pvt.Ltd:
#########################

where the static variables will be stored?
where the instyle variables will be stored?
what are the class loaders in java?
Diff. b/w instance variable and static variable?
what is synchronization? give the example?
How to prevent multithreading in jsp?
what are the JspLifeCycle?
Diff. b/w ArrayList and Vector?
How to convert ArrayList as Synchronized?
Diff. b/w Hashtable and Hashmap?
what are the diff. b/w iterator and Enumerator?
what is the diff b/w StringBuffer & Stringbulider?
what is log4j?
what are the levels of log4j?
what are the types of Appenders in log4j?
How to Build the Ant tool?
Explain the struts flow?
Explain the validate() in struts?
what is the Reflection in java?
Method Overriding in Exception case?
What is the diff. b/w interface and abstract class?
what is the NumberFormatException?
How to show the Exceptions in Jsp?
What is the Singleton Design Pattern?
How to manage the Session object?
Diff. b/w Servlet Outext and Servlet Outing?
Haow to create the Session object in Hibernate?
Diff. b/w Webserver and Application server?
To create the SessionFactory object what will happend?
How to get the particular key value in HashMap?
What is Serialization?
Give the example of Serialization? Which are not serializable and Which are not serializable?

1. Wipro Technologies
##################

overloading and overriding example?
Diff. b/w Hashtable and Hashmap?
Diff. b/w Vector and ArrayList?
Why we will give preference to ArrayList?
where we used in vector?
What is Thin? Diff. b/w Thin and Thick?
How the JspSession Management will done program?
How the JDBCConnection will be Produced Program?
If it possibe multiple constructors in the same class
means different parameters.
How can we call with in the same class? Ans: this

How the Jsp Form Fields will be submitted.
if any error will occur the data fields will be lost
or any where stored? Ans: Bean Or Session
Where the field validation will be done?
Ans: Form Bean
what is DesignPattern? what are the types of design
patterns?
what is the SingleTon DesignPattern?

2. IBM Technologies
################

what is the Diff. b/w Servlets and Jsp?
what are the implicit objects in jsp?
what is the diff. b/w Forward and Include?
what is the diff.b/w JspDirective[<%@JspInclude%>] tag and Jsp:include[<jsp:include>] tag?
Diff. b/w Hashtable and Hashmap?
How many types of Ejb?
Which is the best performance of interface and abstract?
what is the JspLifecycle?

3. Capgemini
#########
Diff. b/w Abstract and Interface?
what is the diff. b/w Jsp:forward tag and rd.forward(".jsp")?
what is the diff. b/w <jsp:include> and <%@JspInclude%> ?
how can we handle the Exceptions in Jsp?
what are the weblogic[7001], tomcat[8080]
websphere[9080] port no?
what is the Latest version of java?
what is Wrapper classes?
final,finally and finalized?
about on ArrayList?
Diff. b/w Hashtable and Hashmap?
Servlet Lifecycle?
tell me about on Custom tag files?
what are the Struts Action classes?
how to use the Cuistom tags in the Struts?
we don't know the which type of collection object will come at Runtime. then it will be take a method to one element and compare and sort that element how can we proceed?
Ans: ArrayList,Vectors,LinkedList,Set?

weblogic:
how the cluster will be done?
how the session Pool settings are done in weblogic?
how Replication done in weblogic server?
how will you write replication code for weblogic in j2ee?
how it user enter 3 fields. if server goes down then what happend?
if 1000 users access the same page at a time in that case what will happend?
write struts validation through programmatic and xml validation?

CVS:
if one user modified content and another user also modified. first user modified if the second user save it what happend?
First change and submit and second user change what happend? First change and submit and second user not chagged then what happend. what file he get?
First will save, Second not saved and not chan ged. if the third user will access what happend?
one to many mapping hbm files? Eg: Employee ------> projects
100
Jbuilder version?
In Eclipse how to PlugIn CVS or SVN?
Name:------
     ------
Attachments
-----------
-----------
   submit
here Btmp files are not allowed and Zip files are allowed? then how to get it errors will be raised?
4. MindTree:
##########
write a program for CRUD Operations using Struts Action calass,design patterns and handle the exceptions? and use all the layers in struts?
what is the servlet?
how to handle exception?
diff. b/w Abstract class and interface?
diff. b/w vector and Arrayist?
what are the abstract class and interfaces?
what is servlet lifecycle?
what is diff. b/w voltaile and Transient?
what is Ejb?
what is the role of Action class in struts?
what is Home interface and Remote interface?
how to validate a FormBean?
what is the method present in Home interface?

5. BOB Technologies:
#################

what is the diff. b/w JRE, JVM,JDK?
SingleTon designPattern Example?
Factory design Pattern?
what is the use of Spring?
how can you write the Userdefined Exceptions?
what are the diff. b/w iterator and Enumerator?
what are the diff. b/w HashMap and HashTable?
HashMap is taken key value as null?
it is possible to take two times key value as null. what will happend?
what is the JspLifeCycle?
how can we careat Session object?
beroree class we can daclare specifiers as sataic? how and what?
what is overriding and oiverloading?
In super class protected is there is iyt possible to override with the public specifier?
how can u write with out using catch block?
how can u write using try and finally ?
what is the diff. b/w throws and throw keywords?
what is the purpose of finally block?
what is abstraction?
what is the diff b/w string,StringBuffer & Stringbulider?
What is the connection pool purpose?

User Request -----> SERVLET   Howmany objects are created? Is it possible multithreading?
    100

6. MarLabs Software Pvt.Ltd:
#########################

where the static variables will be stored?
where the instyle variables will be stored?
what are the class loaders in java?
Diff. b/w instance variable and static variable?
what is synchronization? give the example?
How to prevent multithreading in jsp?
what are the JspLifeCycle?
Diff. b/w ArrayList and Vector?
How to convert ArrayList as Synchronized?
Diff. b/w Hashtable and Hashmap?
what are the diff. b/w iterator and Enumerator?
what is the diff b/w StringBuffer & Stringbulider?
what is log4j?
what are the levels of log4j?
what are the types of Appenders in log4j?
How to Build the Ant tool?
Explain the struts flow?
Explain the validate() in struts?
what is the Reflection in java?
Method Overriding in Exception case?
What is the diff. b/w interface and abstract class?
what is the NumberFormatException?
How to show the Exceptions in Jsp?
What is the Singleton Design Pattern?
How to manage the Session object?
Diff. b/w Servlet Outext and Servlet Outing?
Haow to create the Session object in Hibernate?
Diff. b/w Webserver and Application server?
To create the SessionFactory object what will happend?
How to get the particular key value in HashMap?
What is Serialization?
Give the example of Serialization? Which are not serializable and Which are not serializable?

1. Wipro Technologies
##################

overloading and overriding example?
Diff. b/w Hashtable and Hashmap?
Diff. b/w Vector and ArrayList?
Why we will give preference to ArrayList?
where we used in vector?
What is Thin? Diff. b/w Thin and Thick?
How the JspSession Management will done program?
How the JDBCConnection will be Produced Program?
If it possibe multiple constructors in the same class
means different parameters.
How can we call with in the same class? Ans: this

How the Jsp Form Fields will be submitted.
if any error will occur the data fields will be lost
or any where stored? Ans: Bean Or Session
Where the field validation will be done?
Ans: Form Bean
what is DesignPattern? what are the types of design
patterns?
what is the SingleTon DesignPattern?

2. IBM Technologies
################

what is the Diff. b/w Servlets and Jsp?
what are the implicit objects in jsp?
what is the diff. b/w Forward and Include?
what is the diff.b/w JspDirective[<%@JspInclude%>] tag and Jsp:include[<jsp:include>] tag?
Diff. b/w Hashtable and Hashmap?
How many types of Ejb?
Which is the best performance of interface and abstract?
what is the JspLifecycle?

3. Capgemini
#########
Diff. b/w Abstract and Interface?
what is the diff. b/w Jsp:forward tag and rd.forward(".jsp")?
what is the diff. b/w <jsp:include> and <%@JspInclude%> ?
how can we handle the Exceptions in Jsp?
what are the weblogic[7001], tomcat[8080]
websphere[9080] port no?
what is the Latest version of java?
what is Wrapper classes?
final,finally and finalized?
about on ArrayList?
Diff. b/w Hashtable and Hashmap?
Servlet Lifecycle?
tell me about on Custom tag files?
what are the Struts Action classes?
how to use the Cuistom tags in the Struts?
we don't know the which type of collection object will come at Runtime. then it will be take a method to one element and compare and sort that element how can we proceed?
Ans: ArrayList,Vectors,LinkedList,Set?

weblogic:
how the cluster will be done?
how the session Pool settings are done in weblogic?
how Replication done in weblogic server?
how will you write replication code for weblogic in j2ee?
how it user enter 3 fields. if server goes down then what happend?
if 1000 users access the same page at a time in that case what will happend?
write struts validation through programmatic and xml validation?

CVS:
if one user modified content and another user also modified. first user modified if the second user save it what happend?
First change and submit and second user change what happend? First change and submit and second user not chagged then what happend. what file he get?
First will save, Second not saved and not chan ged. if the third user will access what happend?
one to many mapping hbm files? Eg: Employee ------> projects
100
Jbuilder version?
In Eclipse how to PlugIn CVS or SVN?
Name:------
     ------
Attachments
-----------
-----------
   submit
here Btmp files are not allowed and Zip files are allowed? then how to get it errors will be raised?
4. MindTree:
##########
write a program for CRUD Operations using Struts Action calass,design patterns and handle the exceptions? and use all the layers in struts?
what is the servlet?
how to handle exception?
diff. b/w Abstract class and interface?
diff. b/w vector and Arrayist?
what are the abstract class and interfaces?
what is servlet lifecycle?
what is diff. b/w voltaile and Transient?
what is Ejb?
what is the role of Action class in struts?
what is Home interface and Remote interface?
how to validate a FormBean?
what is the method present in Home interface?

5. BOB Technologies:
#################

what is the diff. b/w JRE, JVM,JDK?
SingleTon designPattern Example?
Factory design Pattern?
what is the use of Spring?
how can you write the Userdefined Exceptions?
what are the diff. b/w iterator and Enumerator?
what are the diff. b/w HashMap and HashTable?
HashMap is taken key value as null?
it is possible to take two times key value as null. what will happend?
what is the JspLifeCycle?
how can we careat Session object?
beroree class we can daclare specifiers as sataic? how and what?
what is overriding and oiverloading?
In super class protected is there is iyt possible to override with the public specifier?
how can u write with out using catch block?
how can u write using try and finally ?
what is the diff. b/w throws and throw keywords?
what is the purpose of finally block?
what is abstraction?
what is the diff b/w string,StringBuffer & Stringbulider?
What is the connection pool purpose?

User Request -----> SERVLET   Howmany objects are created? Is it possible multithreading?
    100

6. MarLabs Software Pvt.Ltd:
#########################

where the static variables will be stored?
where the instyle variables will be stored?
what are the class loaders in java?
Diff. b/w instance variable and static variable?
what is synchronization? give the example?
How to prevent multithreading in jsp?
what are the JspLifeCycle?
Diff. b/w ArrayList and Vector?
How to convert ArrayList as Synchronized?
Diff. b/w Hashtable and Hashmap?
what are the diff. b/w iterator and Enumerator?
what is the diff b/w StringBuffer & Stringbulider?
what is log4j?
what are the levels of log4j?
what are the types of Appenders in log4j?
How to Build the Ant tool?
Explain the struts flow?
Explain the validate() in struts?
what is the Reflection in java?
Method Overriding in Exception case?
What is the diff. b/w interface and abstract class?
what is the NumberFormatException?
How to show the Exceptions in Jsp?
What is the Singleton Design Pattern?
How to manage the Session object?
Diff. b/w Servlet Outext and Servlet Outing?
Haow to create the Session object in Hibernate?
Diff. b/w Webserver and Application server?
To create the SessionFactory object what will happend?
How to get the particular key value in HashMap?
What is Serialization?
Give the example of Serialization? Which are not serializable and Which are not serializable?

java interview question and their answers,which are given at satya technologies,hyderabad.

What is the diffrence between an Abstract class and Interface ?
What is user defined exception ?
What do you know about the garbate collector ?
What is the difference between C++ & Java ?
Explain RMI Architecture?
How do you communicate in between Applets & Servlets ?
What is the use of Servlets ?
What is JDBC? How do you connect to the Database ?
In an HTML form I have a Button which makes us to open another page in 15 seconds. How will do you that ?
What is the difference between Process and Threads ?
What is the difference between RMI & Corba ?
What are the services in RMI ?
How will you initialize an Applet ?
What is the order of method invocation in an Applet ?
When is update method called ?
How will you pass values from HTML page to the Servlet ?
Have you ever used HashTable and Dictionary ?
How will you communicate between two Applets ?
What are statements in JAVA ?
What is JAR file ?
What is JNI ?
What is the base class for all swing components ?
What is JFC ?
What is Difference between AWT and Swing ?
Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times? Where 3 processes are started or 3 threads are started ?
How does thread synchronization occurs inside a monitor ?
How will you call an Applet using a Java Script function ?
Is there any tag in HTML to upload and download files ?
Why do you Canvas ?
How can you push data from an Applet to Servlet ?
What are 4 drivers available in JDBC ?
How you can know about drivers and database information ?
If you are truncated using JDBC, How can you know ..that how much data is truncated ?
And What situation , each of the 4 drivers used ?
How will you perform transaction using JDBC ?
In RMI, server object first loaded into the memory and then the stub reference is sent to the client ? or whether a stub reference is directly sent to the client ?
Suppose server object is not loaded into the memory, and the client request for it , what will happen?
What is serialization ?
Can you load the server object dynamically? If so, what are the major 3 steps involved in it ?
What is difference RMI registry and OSAgent ?
To a server method, the client wants to send a value 20, with this value exceeds to 20,. a message should be sent to the client ? What will you do for achieving for this ?
What are the benefits of Swing over AWT ?
Where the CardLayout is used ?
What is the Layout for ToolBar ?
What is the difference between Grid and GridbagLayout ?
How will you add panel to a Frame ?
What is the corresponding Layout for Card in Swing ?
What is light weight component ?
Can you run the product development on all operating systems ?
What is the webserver used for running the Servlets ?
What is Servlet API used for conneting database ?
What is bean ? Where it can be used ?
What is difference in between Java Class and Bean ?
Can we send object using Sockets ?
What is the RMI and Socket ?
How to communicate 2 threads each other ?
What are the files generated after using IDL to Java Compilet ?
What is the protocol used by server and client ?
Can I modify an object in CORBA ?
What is the functionality stubs and skeletons ?
What is the mapping mechanism used by Java to identify IDL language ?
Diff between Application and Applet ?
What is serializable Interface ?
What is the difference between CGI and Servlet ?
What is the use of Interface ?
Why Java is not fully objective oriented ?
Why does not support multiple Inheritance ?
What it the root class for all Java classes ?
What is polymorphism ?
Suppose If we have variable ' I ' in run method, If I can create one or more thread each thread will occupy a separate copy or same variable will be shared ?
In servlets, we are having a web page that is invoking servlets username and password ? which is cheks in the database ? Suppose the second page also If we want to verify the same information whethe it will connect to the database or it will be used previous information?
What are virtual functions ?
Write down how will you create a binary Tree ?
What are the traverses in Binary Tree ?
Write a program for recursive Traverse ?
What are session variable in Servlets ?
What is client server computing ?
What is Constructor and Virtual function? Can we call Virtual funciton in a constructor ?
Why we use OOPS concepts? What is its advantage ?
What is the middleware ? What is the functionality of Webserver ?
Why Java is not 100 % pure OOPS ? ( EcomServer )
When we will use an Interface and Abstract class ?
What is an RMI?
How will you pass parameters in RMI ? Why u serialize?
What is the exact difference in between Unicast and Multicast object ? Where we will use ?
What is the main functionality of the Remote Reference Layer ?
How do you download stubs from a Remote place ?
What is the difference in between C++ and Java ? can u explain in detail ?
I want to store more than 10 objects in a remote server ? Which methodology will follow ?
What is the main functionality of the Prepared Statement ?
What is meant by static query and dynamic query ?
What are the Normalization Rules ? Define the Normalization ?
What is meant by Servelet? What are the parameters of the service method ?
What is meant by Session ? Tell me something about HTTPSession Class ?
How do you invoke a Servelt? What is the difference in between doPost and doGet methods ?
What is the difference in between the HTTPServlet and Generic Servlet ? Expalin their methods ? Tell me their parameter names also ?
Have you used threads in Servelet ?
Write a program on RMI and JDBC using StoredProcedure ?
How do you sing an Applet ?
In a Container there are 5 components. I want to display the all the components names, how will you do that one ?
Why there are some null interface in java ? What does it mean ? Give me some null interfaces in JAVA ?
Tell me the latest versions in JAVA related areas ?
What is meant by class loader ? How many types are there? When will we use them ?
How do you load an Image in a Servlet ?
What is meant by flickering ?
What is meant by distributed Application ? Why we are using that in our applications ?
What is the functionality of the stub ?
Have you used any version control ?
What is the latest version of JDBC ? What are the new features are added in that ?
Explain 2 tier and 3 -tier Architecture ?
What is the role of the webserver ?
How have you done validation of the fileds in your project ?
What is the main difficulties that you are faced in your project ?
What is meant by cookies ? Explain ?
Problem faced in your earlier project
How OOPS concept is achieved in Java
Features for using Java
How does Java 2.0 differ from Java 1.0
Public static void main – Explain
What are command line arguments
Explain about the three-tier model
Difference between String & StringBuffer
Wrapper class. Is String a Wrapper Class
What are the restriction for static method
Purpose of the file class
Default modifier in Interface
Difference between Interface & Abstract class
Can abstract be declared as Final
Can we declare variables inside a method as Final Variables
What is the package concept and use of package
How can a dead thread be started
Difference between Applet & Application
Life cycle of the Applet
Can Applet have constructors
Differeence between canvas class & graphics class
Explain about Superclass & subclass
Difference between TCP & UDP
What is AppletStub
Explain Stream Tokenizer
What is the difference between two types of threads
Checked & Unchecked exception
Use of throws exception
What is finally in exception handling
Vector class
What will happen to the Exception object after exception handling
Two types of multi-tasking
Two ways to create the thread
Synchronization
I/O Filter
How can you retrieve warnings in JDBC
Can applet in different page communicate with each other
Four driver Manager
Features of JDBC 20
Explain about stored procedures
Servlet Life cycle
Why do you go for servlet rather than CGI
How to generate skeleton & Stub classes
Explain lazy activation
Firewalls in RMI

What is meant by Java ?
What is meant by a class ?
What is meant by a method ?
What are the OOPS concepts in Java ?
What is meant by encapsulation ? Explain with an example
What is meant by inheritance ? Explain with an example
What is meant by polymorphism ? Explain with an example
Is multiple inheritance allowed in Java ? Why ?
What is meant by Java interpreter ?
What is meant by JVM ?
What is a compilation unit ?
What is meant by identifiers ?
What are the different types of modifiers ?
What are the access modifiers in Java ?
What are the primitive data types in Java ?
What is meant by a wrapper class ?
What is meant by static variable and static method ?
What is meant by Garbage collection ?
What is meant by abstract class
What is meant by final class, methods and variables ?
What is meant by interface ?
What is meant by a resource leak ?
What is the difference between interface and abstract class ?
What is the difference between public private, protected and static
What is meant by method overloading ?
What is meant by method overriding ?
What is singleton class ?
What is the difference between an array and a vector ?
What is meant by constructor ?
What is meant by casting ?
What is the difference between final, finally and finalize ?
What is meant by packages ?
What are all the packages ?
Name 2 calsses you have used ?
Name 2 classes that can store arbitrary number of objects ?
What is the difference between java.applet.* and java.applet.Applet ?
What is a default package ?
What is meant by a super class and how can you call a super class ?
What is anonymous class ?
Name interfaces without a method ?
What is the use of an interface ?
What is a serializable interface ?
How to prevent field from serialization ?
What is meant by exception ?
How can you avoid the runtime exception ?
What is the difference between throw and throws ?
What is the use of finally ?
Can multiple catch statements be used in exceptions ?
Is it possible to write a try within a try statement ?
What is the method to find if the object exited or not ?
What is meant by a Thread ?
What is meant by multi-threading ?
What is the 2 way of creating a thread ? Which is the best way and why ?
What is the method to find if a thread is active or not ?
What are the thread-to-thread communcation ?
What is the difference between sleep and suspend ?
Can thread become a member of another thread ?
What is meant by deadlock ?
How can you avoid a deadlock ?
What are the three typs of priority ?
What is the use of synchronizations ?
Garbage collector thread belongs to which priority ?
What is meant by time-slicing ?
What is the use of ‘this’ ?
How can you find the length and capacity of a string buffer ?
How to compare two strings ?
What are the interfaces defined by Java.lang ?
What is the purpose of run-time class and system class
What is meant by Stream and Types ?
What is the method used to clear the buffer ?
What is meant by Stream Tokenizer ?
What is serialization and de-serialisation ?
What is meant by Applet ?
How to find the host from which the Applet has originated ?
What is the life cycle of an Applet ?
How do you load an HTML page from an Applet ?
What is meant by Applet Stub Interface ?
What is meant by getCodeBase and getDocumentBase method ?
How can you call an applet from a HTML file
What is meant by Applet Flickering ?
What is the use of parameter tag ?
What is audio clip Interface and what are all the methods in it ?
What is the difference between getAppletInfo and getParameterInfo ?
How to communicate between applet and an applet ?
What is meant by event handling ?
What are all the listeners in java and explain ?
What is meant by an adapter class ?
What are the types of mouse event listeners ?
What are the types of methods in mouse listeners ?
What is the difference between panel and frame ?
What is the default layout of the panel and frame ?
What is meant by controls and types ?
What is the difference between a scroll bar and a scroll panel.
What is the difference between list and choice ?
How to place a component on Windows ?
What are the different types of Layouts ?
What is meant by CardLayout ?
What is the difference between GridLayout and GridBagLayout
What is the difference between menuitem and checkboxmenu item.
What is meant by vector class, dictionary class , hash table class,and property class ?
Which class has no duplicate elements ?
What is resource bundle ?
What is an enumeration class ?
What is meant by Swing ?
What is the difference between AWT and Swing ?
What is the difference between an applet and a Japplet
What are all the components used in Swing ?
What is meant by tab pans ?
What is the use of JTree ?
How can you add and remove nodes in Jtree.
What is the method to expand and collapse nodes in a Jtree ?
What is the use of JTable ?
What is meant by JFC ?
What is the class in Swing to change the appearance of the Frame in Runtime.
How to reduce flicking in animation ?
What is JDBC ?
How do you connect to the database ? What are the steps ?
What are the drivers available in JDBC ? Explain
How can you load the driver ?
What are the different types of statement s ?
How can you created JDBC statements ?
How will you perform transactions using JDBC ?
What are the two drivers for web apllication?
What are the different types of 2 tier and 3 tier architecture ?
How can you retrieve warning in JDBC ?
What is the exception thrown by JDBC ?
What is meants by PreparedStatement ?
What is difference between PreparedStatement and Statement ?
How can you call the stored procedures ?
What is meant by a ResultSet ?
What is the difference between ExecuteUpdate and ExecuteQuery ?
How do you know which driver is connected to a database ?
What is DSN and System DSN and differentiate these two ?
What is meant by TCP, IP, UDP ?
What is the difference between TCP and UDP ?
What is a proxy server ?
What is meant by URL
What is a socket and server sockets ?
When MalformedURLException and UnknownHost Exception throws ?
What is InetAddress ?
What is datagram and datagram packets and datagram sockets ?
Write the range of multicast socket IP address ?
What is meant by a servlet ?
What are the types of servlets ? Explain
What is the different between a Servlet and a CGI.
What is the difference between 2 types of Servlets ?
What is the type of method for sending request from HTTP server ?
What are the exceptions thrown by Servlets ? Why ?
What is the life cycle of a servlet ?
What is meant by cookies ?
What is HTTP Session ?
What is the difference between GET and POST methods ?
How can you run a Servlet Program ?
How to commuincate between an applet and a servlet ?
What is a Servlet-to-Servlet communcation ?
What is Session Tracking ?
What are the security issues in Servlets ?
What is HTTP Tunneling
How do you load an image in a Servlet ?
What is Servlet Chaining ?
What is URL Rewriting ?
What is context switching ?
What is meant by RMI ?
Explain RMI Architecture ?
What is meant by a stub ?
What is meant by a skelotn ?
What is meant by serialisation and deserialisation ?
What is meant by RRL ?
What is the use of TL ?
What is RMI Registry ?
What is rmic ?
How will you pass parameter in RMI ?
What exceptions are thrown by RMI ?
What are the steps involved in RMI ?
What is meant by bind(), rebind(), unbind() and lookup() methods
What are the advanatages of RMI ?
What is JNI ?
What is Remote Interface ?
What class is used to create Server side object ?
What class is used to bind the server object with RMI Registry ?
What is the use of getWriter method ?
What is meant by Javabeans ?
What is JAR file ?
What is meant by manifest files ?
What is Introspection ?
What are the steps involved to create a bean ?
Say any two properties in Beans ?
What is persistence ?
What is the use of beaninfo ?
What are the interfaces you used in Beans ?
What are the classes you used in Beans ?

What is Entity Bean and Session Bean ?
What are the methods of Entity Bean?
How does Stateful Session bean store its state ?
Why does Stateless Session bean not store its state even though it has ejbActivate and ejbPassivate ?
What are the services provided by the container ?
Types of transaction ?
What is bean managed transaction ?
Why does EJB needs two interface( Home and Remote Interface) ?
What are transaction attributes ?
What is the difference between Container managed persistent bean and Bean managed persistent entity bean ?
What is J2EE ?
What is JTS ?
How many entity beans used and how many tables can u use in EJB project ?
What is scalable,portability in J2EE?
What is Connection pooling?Is it advantageous?
Method and class used for Connection pooling ?
How to deploy in J2EE(i.e Jar,War file) ?
How is entity bean created using Container managed entity bean ?
Sotware architechture of EJB ?
In Entity bean will the create method in EJB home and ejbCreate in Entity bean have the same parameters ?
What methods do u use in Servlet – Applet communication ?
What are the types of Servlet ?
Difference between HttpServlet and Generic Servlets ?
Difference between doGet and doPost ?
What are the methods in HttpServlet?
What are the types of SessionTracking?
What is Cookie ? Why is Cookie used ?
If my browser does not support Cookie,and my server sends a cookie instance What will happen ?
Why do u use Session Tracking in HttpServlet ?
Can u use javaScript in Servlets ?
What is the capacity the doGet can send to the server ?
What are the type of protocols used in HttpServlet ?
Difference between TCP/IP and IP protocol ?
Why do you use UniCastRemoteObject in RMI ?
How many interfaces are used in RMI?
Can Rmi registry be written in the code, without having to write it in the command prompt and if yes where?
Why is Socket used ?
What are the types of JDBC drivers ?
Explain the third driver(Native protocol driver) ?
Which among the four driver is pure Java driver ?
What are the Isolation level in JDBC transaction ?
How do you connect with the database ?
How do you connect without the Class.forName (" ") ?
What does Class.forName return ?
What are the types of statement ?
Why is preparedStatement,CallableStatement used for?
In real time project which driver did u use ?
Difference between AWT and Swing compenents ?
Is there any heavy weight component in Swings ?
Can the Swing application if you upload in net, be compatible with your browser?
What should you do get your browser compatible with swing components?
What are the methods in Applet ?
When is init(),start() called ?
When you navigate from one applet to another what are the methods called ?
What is the difference between Trusted and Untrusted Applet ?
What is Exception ?
What are the ways you can handle exception ?
When is try,catch block used ?
What is finally method in Exceptions ?
What are the types of access modifiers ?
What is protected and friendly ?
What are the other modifiers ?
Is synchronised modifier ?
What is meant by polymorphism ?
What is inheritance ?
What is method Overloading ? What is this in OOPS ?
What is method Overriding ? What is it in OOPS ?
Does java support multi dimensional arrays ?
Is multiple inheritance used in Java ?
How do you send a message to the browser in JavaScript ?
Does javascript support multidimensional arrays ?
Why is XML used mainly?
Do use coding for database connectivity in XML?
What is DTD ?
Is there any tool in java that can create reports ?

1.what is a transient variable?

A transient variable is a variable that may not be serialized.

2.which containers use a border Layout as their default layout?

The window, Frame and Dialog classes use a border layout as their default layout.

3.Why do threads block on I/O?

Threads block on i/o (that is enters the waiting state) so that other threads may execute while the i/o

Operation is performed.

4. How are Observer and Observable used?

Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by objects that observe Observable objects.

5. What is synchronization and why is it important?

With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one thread to modify a shared object while another thread is in the process of using or updating that object's value. This often leads to significant errors.

6. Can a lock be acquired on a class?

Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object.

7. What's new with the stop(), suspend() and resume() methods in JDK 1.2?

The stop(), suspend() and resume() methods have been deprecated in JDK 1.2.

8. Is null a keyword?

The null value is not a keyword.

9. What is the preferred size of a component?

The preferred size of a component is the minimum component size that will allow the component to display normally.

10. What method is used to specify a container's layout?

The setLayout() method is used to specify a container's layout.

11. Which containers use a FlowLayout as their default layout?

The Panel and Applet classes use the FlowLayout as their default layout.

12. What state does a thread enter when it terminates its processing?

When a thread terminates its processing, it enters the dead state.

13. What is the Collections API?

The Collections API is a set of classes and interfaces that support operations on collections of objects.

14. Which characters may be used as the second character of an identifier,

but not as the first character of an identifier?

The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the first character of an identifier.

15. What is the List interface?

The List interface provides support for ordered collections of objects.

16. How does Java handle integer overflows and underflows?

It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.

17. What is the Vector class?

The Vector class provides the capability to implement a growable array of objects

18. What modifiers may be used with an inner class that is a member of an outer class?

A (non-local) inner class may be declared as public, protected, private, static, final, or abstract.

19. What is an Iterator interface?

The Iterator interface is used to step through the elements of a Collection.

20. What is the difference between the >> and >>> operators?

The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that have been shifted out.

21. Which method of the Component class is used to set the position and

size of a component?

setBounds()

22. How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?

Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bit and larger bit patterns.

23What is the difference between yielding and sleeping?

When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.

24. Which java.util classes and interfaces support event handling?

The EventObject class and the EventListener interface support event processing.

25. Is sizeof a keyword?

The sizeof operator is not a keyword.

26. What are wrapped classes?

Wrapped classes are classes that allow primitive types to be accessed as objects.

27. Does garbage collection guarantee that a program will not run out of memory?

Garbage collection does not guarantee that a program will not run out of memory. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection

28. What restrictions are placed on the location of a package statement

within a source code file?

A package statement must appear as the first line in a source code file (excluding blank lines and comments).

29. Can an object's finalize() method be invoked while it is reachable?

An object's finalize() method cannot be invoked by the garbage collector while the object is still reachable. However, an object's finalize() method may be invoked by other objects.

30. What is the immediate superclass of the Applet class?

Panel

31. What is the difference between preemptive scheduling and time slicing?

Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and

other factors.

32. Name three Component subclasses that support painting.

The Canvas, Frame, Panel, and Applet classes support painting.

33. What value does readLine() return when it has reached the end of a file?

The readLine() method returns null when it has reached the end of a file.

34. What is the immediate superclass of the Dialog class?

Window

35. What is clipping?

Clipping is the process of confining paint operations to a limited area or shape.

36. What is a native method?

A native method is a method that is implemented in a language other than Java.

37. Can a for statement loop indefinitely?

Yes, a for statement can loop indefinitely. For example, consider the following:

for(;;) ;

38. What are order of precedence and associativity, and how are they used?

Order of precedence determines the order in which operators are evaluated in expressions. Associatity determines whether an expression is evaluated left-to-right or right-to-left

39. When a thread blocks on I/O, what state does it enter?

A thread enters the waiting state when it blocks on I/O.

40. To what value is a variable of the String type automatically initialized?

The default value of an String type is null.

41. What is the catch or declare rule for method declarations?

If a checked exception may be thrown within the body of a method, the method must either catch the exception or declare it in its throws clause.

42. What is the difference between a MenuItem and a CheckboxMenuItem?

The CheckboxMenuItem class extends the MenuItem class to support a menu item that may be checked or unchecked.

43. What is a task's priority and how is it used in scheduling?

A task's priority is an integer value that identifies the relative order in which it should be executed with respect to other tasks. The scheduler attempts to schedule higher priority tasks before lower priority tasks.

44. What class is the top of the AWT event hierarchy?

The java.awt.AWTEvent class is the highest-level class in the AWT event-class hierarchy.

45. When a thread is created and started, what is its initial state?

A thread is in the ready state after it has been created and started.

46. Can an anonymous class be declared as implementing an interface and extending a class?

An anonymous class may implement an interface or extend a superclass, but may not be declared to do both.

47. What is the range of the short type?

The range of the short type is -(2^15) to 2^15 - 1.

48. What is the range of the char type?

The range of the char type is 0 to 2^16 - 1.

49. In which package are most of the AWT events that support the event-delegation

model defined?

Most of the AWT-related events of the event-delegation model are defined in the java.awt.event package. The AWTEvent class is defined in the java.awt package.

50. What is the immediate superclass of Menu?

MenuItem

51. What is the purpose of finalization?

The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected.

52. Which class is the immediate superclass of the MenuComponent class.

Object

53. What invokes a thread's run() method?

After a thread is started, via its start() method or that of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed.

54. What is the difference between the Boolean & operator and the && operator?

If an expression involving the Boolean & operator is evaluated, both operands are evaluated. Then the & operator is applied to the operand. When an expression involving the && operator is evaluated, the first operand is evaluated. If the first operand returns a value of true then the second operand is evaluated. The && operator is then applied to the first and second operands. If the first operand evaluates to false, the evaluation of the second operand is skipped.

55. Name three subclasses of the Component class.

Box.Filler, Button, Canvas, Checkbox, Choice, Container, Label, List, Scrollbar, or TextComponent

56. What is the GregorianCalendar class?

The GregorianCalendar provides support for traditional Western calendars.

57. Which Container method is used to cause a container to be laid out and redisplayed?

validate()

58. What is the purpose of the Runtime class?

The purpose of the Runtime class is to provide access to the Java runtime system.

59. How many times may an object's finalize() method be invoked by the

garbage collector?

An object's finalize() method may only be invoked once by the garbage collector.

60. What is the purpose of the finally clause of a try-catch-finally statement?

The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught.

61. What is the argument type of a program's main() method?

A program's main() method takes an argument of the String[] type.

62. Which Java operator is right associative?

The = operator is right associative.

63. What is the Locale class?

The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region.

64. Can a double value be cast to a byte?

Yes, a double value can be cast to a byte.

65. What is the difference between a break statement and a continue statement?

A break statement results in the termination of the statement to which it applies (switch, for, do, or while). A continue statement is used to end the current loop iteration and return control to the loop statement.

66. What must a class do to implement an interface?

It must provide all of the methods in the interface and identify the interface in its implements clause.

67. What method is invoked to cause an object to begin executing as a separate thread?

The start() method of the Thread class is invoked to cause an object to begin executing as a separate thread.

68. Name two subclasses of the TextComponent class.

TextField and TextArea

69. What is the advantage of the event-delegation model over the earlier event-inheritance model?

The event-delegation model has two advantages over the event-inheritance model. First, it enables event handling to be handled by objects other than the ones that generate the events (or their containers). This allows a clean separation

between a component's design and its use. The other advantage of the event-delegation model is that it performs much better in applications where many events are generated. This performance improvement is due to the fact that the event-delegation model does not have to repeatedly process unhandled events, as is the case of the event-inheritance

model.

70. Which containers may have a MenuBar?

Frame

71. How are commas used in the intialization and iteration parts of a for statement?

Commas are used to separate multiple statements within the initialization and iteration parts of a for statement.

72. What is the purpose of the wait(), notify(), and notifyAll() methods?

The wait(),notify(), and notifyAll() methods are used to provide an efficient way for threads to wait for a shared resource. When a thread executes an object's wait() method, it enters the waiting state. It only enters the ready state after another thread invokes the object's notify() or notifyAll() methods.

73. What is an abstract method?

An abstract method is a method whose implementation is deferred to a subclass.

74. How are Java source code files named?

A Java source code file takes the name of a public class or interface that is defined within the file. A source code file may contain at most one public class or interface. If a public class or interface is defined within a source code file, then the source code file must take the name of the public class or interface. If no public class or interface is defined

within a source code file, then the file must take on a name that is different than its classes and interfaces. Source code files use the .java extension.

75. What is the relationship between the Canvas class and the Graphics class?

A Canvas object provides access to a Graphics object via its paint() method.

76. What are the high-level thread states?

The high-level thread states are ready, running, waiting, and dead.

77. What value does read() return when it has reached the end of a file?

The read() method returns -1 when it has reached the end of a file.

78. Can a Byte object be cast to a double value?

No, an object cannot be cast to a primitive value.

79. What is the difference between a static and a non-static inner class?

A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances.

80. What is the difference between the String and StringBuffer classes?

String objects are constants. StringBuffer objects are not.

81. If a variable is declared as private, where may the variable be accessed?

A private variable may only be accessed within the class in which it is declared.

82. What is an object's lock and which object's have locks?

An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have locks. A class's lock is acquired on the class's Class object.

83. What is the Dictionary class?

The Dictionary class provides the capability to store key-value pairs.

84. How are the elements of a BorderLayout organized?

The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container.

85. What is the % operator?

It is referred to as the modulo or remainder operator. It returns the remainder of dividing the first operand by the second operand.

86. When can an object reference be cast to an interface reference?

An object reference be cast to an interface reference when the object implements the referenced interface.

87. What is the difference between a Window and a Frame?

The Frame class extends Window to define a main application window that can have a menu bar.

88. Which class is extended by all other classes?

The Object class is extended by all other classes.

89. Can an object be garbage collected while it is still reachable?

A reachable object cannot be garbage collected. Only unreachable objects may be garbage collected..

90. Is the ternary operator written x : y ? z or x ? y : z ?

It is written x ? y : z.

91. What is the difference between the Font and FontMetrics classes?

The FontMetrics class is used to define implementation-specific properties, such as ascent and descent, of a Font object.

92. How is rounding performed under integer division?

The fractional part of the result is truncated. This is known as rounding toward zero.

93. What happens when a thread cannot acquire a lock on an object?

If a thread attempts to execute a synchronized method or synchronized statement and is unable to acquire an object's lock, it enters the waiting state until the lock becomes available.

94. What is the difference between the Reader/Writer class hierarchy and the

InputStream/OutputStream class hierarchy?

The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented.

95. What classes of exceptions may be caught by a catch clause?

A catch clause can catch any exception that may be assigned to the Throwable type. This includes the Error and Exception types.

96. If a class is declared without any access modifiers, where may the class be accessed?

A class that is declared without any access modifiers is said to have package access. This means that the class can only be accessed by other classes and interfaces that are defined within the same package.

97. What is the SimpleTimeZone class?

The SimpleTimeZone class provides support for a Gregorian calendar.

98. What is the Map interface?

The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values.

99. Does a class inherit the constructors of its superclass?

A class does not inherit constructors from any of its superclasses.

100. For which statements does it make sense to use a label?

The only statements for which it makes sense to use a label are those statements that can enclose a break or continue statement.

101. What is the purpose of the System class?

The purpose of the System class is to provide access to system resources.

102. Which TextComponent method is used to set a TextComponent to the read-only state?

setEditable()

103. How are the elements of a CardLayout organized?

The elements of a CardLayout are stacked, one on top of the other, like a deck of cards.

104. Is &&= a valid Java operator?

No, it is not.

105. Name the eight primitive Java types.

The eight primitive types are byte, char, short, int, long, float, double, and boolean.

106. Which class should you use to obtain design information about an object?

The Class class is used to obtain information about an object's design.

107. What is the relationship between clipping and repainting?

When a window is repainted by the AWT painting thread, it sets the clipping regions to the area of the window that requires repainting.

108. Is "abc" a primitive value?

The String literal "abc" is not a primitive value. It is a String object.

109. What is the relationship between an event-listener interface and an

event-adapter class?

An event-listener interface defines the methods that must be implemented by an event handler for a particular kind of event. An event adapter provides a default implementation of an event-listener interface.

110. What restrictions are placed on the values of each case of a switch statement?

During compilation, the values of each case of a switch statement must evaluate to a value that can be promoted to an int value.

111. What modifiers may be used with an interface declaration?

An interface may be declared as public or abstract.

112. Is a class a subclass of itself?

A class is a subclass of itself.

113. What is the highest-level event class of the event-delegation model?

The java.util.EventObject class is the highest-level class in the event-delegation class hierarchy.

114. What event results from the clicking of a button?

The ActionEvent event is generated as the result of the clicking of a button.

115. How can a GUI component handle its own events?

A component can handle its own events by implementing the required event-listener interface and adding itself as its own event listener.

116. What is the difference between a while statement and a do statement?

A while statement checks at the beginning of a loop to see whether the next loop iteration should occur. A do statement checks at the end of a loop to see whether the next iteration of a loop should occur. The do statement will

always execute the body of a loop at least once.

117. How are the elements of a GridBagLayout organized?

The elements of a GridBagLayout are organized according to a grid. However, the elements are of different sizes and may occupy more than one row or column of the grid. In addition, the rows and columns may have different sizes.

118. What advantage do Java's layout managers provide over traditional windowing systems?

Java uses layout managers to lay out components in a consistent manner across all windowing platforms. Since Java's layout managers aren't tied to absolute sizing and positioning, they are able to accomodate platform-specific differences among windowing systems.

119. What is the Collection interface?

The Collection interface provides support for the implementation of a mathematical bag - an unordered collection of objects that may contain duplicates.

120. What modifiers can be used with a local inner class?

A local inner class may be final or abstract.

121. What is the difference between static and non-static variables?

A static variable is associated with the class as a whole rather than with specific instances of a class. Non-static variables take on unique values with each object instance.

122. What is the difference between the paint() and repaint() methods?

The paint() method supports painting via a Graphics object. The repaint() method is used to cause paint() to be invoked by the AWT painting thread.

123. What is the purpose of the File class?

The File class is used to create objects that provide access to the files and directories of a local file system.

124. Can an exception be rethrown?

Yes, an exception can be rethrown.

125. Which Math method is used to calculate the absolute value of a number?

The abs() method is used to calculate absolute values.

126. How does multithreading take place on a computer with a single CPU?

The operating system's task scheduler allocates execution time to multiple tasks. By quickly switching between executing tasks, it creates the impression that tasks execute sequentially.

127. When does the compiler supply a default constructor for a class?

The compiler supplies a default constructor for a class if no other constructors are provided.

128. When is the finally clause of a try-catch-finally statement executed?

The finally clause of the try-catch-finally statement is always executed unless the thread of execution terminates or an exception occurs within the execution of the finally clause.

129. Which class is the immediate superclass of the Container class?

Component

130. If a method is declared as protected, where may the method be accessed?

A protected method may only be accessed by classes or interfaces of the same package or by subclasses of the class in which it is declared.

131. How can the Checkbox class be used to create a radio button?

By associating Checkbox objects with a CheckboxGroup.

132. Which non-Unicode letter characters may be used as the first character

of an identifier?

The non-Unicode letter characters $ and _ may appear as the first character of an identifier

133. What restrictions are placed on method overloading?

Two methods may not have the same name and argument list but different return types.

134. What happens when you invoke a thread's interrupt method while it is

sleeping or waiting?

When a task's interrupt() method is executed, the task enters the ready state. The next time the task enters the running state, an InterruptedException is thrown.

135. What is casting?

There are two types of casting, casting between primitive numeric types and casting between object references. Casting between numeric types is used to convert larger values, such as double values, to smaller values, such as byte

values. Casting between object references is used to refer to an object by a compatible class, interface, or array type reference.

136. What is the return type of a program's main() method?

A program's main() method has a void return type.

137. Name four Container classes.

Window, Frame, Dialog, FileDialog, Panel, Applet, or ScrollPane

138. What is the difference between a Choice and a List?

A Choice is displayed in a compact form that requires you to pull it down to see the list of available choices. Only one item may be selected from a Choice. A List may be displayed in such a way that several List items are visible. A List supports the selection of one or more List items.

139. What class of exceptions are generated by the Java run-time system?

The Java runtime system generates RuntimeException and Error exceptions.

140. What class allows you to read objects directly from a stream?

The ObjectInputStream class supports the reading of objects from input streams.

141. What is the difference between a field variable and a local variable?

A field variable is a variable that is declared as a member of a class. A local variable is a variable that is declared local to a method.

142. Under what conditions is an object's finalize() method invoked by the garbage collector?

The garbage collector invokes an object's finalize() method when it detects that the object has become unreachable.

143. How are this() and super() used with constructors?

this() is used to invoke a constructor of the same class. super() is used to invoke a superclass constructor.

144. What is the relationship between a method's throws clause and the exceptions

that can be thrown during the method's execution?

A method's throws clause must declare any checked exceptions that are not caught within the body of the method.

145. What is the difference between the JDK 1.02 event model and the event-delegation

model introduced with JDK 1.1?

The JDK 1.02 event model uses an event inheritance or bubbling approach. In this model, components are required to handle their own events. If they do not handle a particular event, the event is inherited by (or bubbled up to) the component's container. The container then either handles the event or it is bubbled up to its container and so on, until the highest-level container has been tried.

In the event-delegation model, specific objects are designated as event handlers for GUI components. These objects implement event-listener interfaces. The event-delegation model is more efficient than the event-inheritance model because it eliminates the processing required to support the bubbling of unhandled events.

146. How is it possible for two String objects with identical values not to be equal

under the == operator?

The == operator compares two objects to determine if they are the same object in memory. It is possible for two String objects to have the same value, but located indifferent areas of memory.

147. Why are the methods of the Math class static?

So they can be invoked as if they are a mathematical code library.

148. What Checkbox method allows you to tell if a Checkbox is checked?

getState()

149. What state is a thread in when it is executing?

An executing thread is in the running state.

150. What are the legal operands of the instanceof operator?

The left operand is an object reference or null value and the right operand is a class, interface, or array type.

151. How are the elements of a GridLayout organized?

The elements of a GridBad layout are of equal size and are laid out using the squares of a grid.

152. What an I/O filter?

An I/O filter is an object that reads from one stream and writes to another, usually altering the data in some way as it is passed from one stream to another.

153. If an object is garbage collected, can it become reachable again?

Once an object is garbage collected, it ceases to exist. It can no longer become reachable again.

154. What is the Set interface?

The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements.

155. What classes of exceptions may be thrown by a throw statement?

A throw statement may throw any expression that may be assigned to the Throwable type.

156. What are E and PI?

E is the base of the natural logarithm and PI is mathematical value pi.

157. Are true and false keywords?

The values true and false are not keywords.

158. What is a void return type?

A void return type indicates that a method does not return a value.

159. What is the purpose of the enableEvents() method?

The enableEvents() method is used to enable an event for a particular object. Normally, an event is enabled when a listener is added to an object for a particular event. The enableEvents() method is used by objects that handle events by overriding their event-dispatch methods.

160. What is the difference between the File and RandomAccessFile classes?

The File class encapsulates the files and directories of the local file system. The RandomAccessFile class provides the methods needed to directly access data contained in any part of a file.

161. What happens when you add a double value to a String?

The result is a String object.

162. What is your platform's default character encoding?

If you are running Java on English Windows platforms, it is probably Cp1252. If you are running Java on English Solaris platforms, it is most likely 8859_1..

163. Which package is always imported by default?

The java.lang package is always imported by default.

164. What interface must an object implement before it can be written to a

stream as an object?

An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object.

165. How are this and super used?

this is used to refer to the current object instance. super is used to refer to the variables and methods of the superclass of the current object instance.

166. What is the purpose of garbage collection?

The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources may be reclaimed and

reused.

167. What is a compilation unit?

A compilation unit is a Java source code file.

168. What interface is extended by AWT event listeners?

All AWT event listeners extend the java.util.EventListener interface.

169. What restrictions are placed on method overriding?

Overridden methods must have the same name, argument list, and return type.

The overriding method may not limit the access of the method it overrides.

The overriding method may not throw any exceptions that may not be thrown

by the overridden method.

170. How can a dead thread be restarted?

A dead thread cannot be restarted.

171. What happens if an exception is not caught?

An uncaught exception results in the uncaughtException() method of the thread's ThreadGroup being invoked, which eventually results in the termination of the program in which it is thrown.

172. What is a layout manager?

A layout manager is an object that is used to organize components in a container.

173. Which arithmetic operations can result in the throwing of an ArithmeticException?

Integer / and % can result in the throwing of an ArithmeticException.

174. What are three ways in which a thread can enter the waiting state?

A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoking its

(deprecated) suspend() method.

175. Can an abstract class be final?

An abstract class may not be declared as final.

176. What is the ResourceBundle class?

The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program's appearance to the particular locale in which it is being run.

177. What happens if a try-catch-finally statement does not have a catch clause

to handle an exception that is thrown within the body of the try statement?

The exception propagates up to the next higher level try-catch statement (if any) or results in the program's termination.

178. What is numeric promotion?

Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place. In numerical promotion, byte, char, and short values are converted to int

values. The int values are also converted to long values, if necessary. The long and float values are converted to double values, as required.

179. What is the difference between a Scrollbar and a ScrollPane?

A Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs its own scrolling.

180. What is the difference between a public and a non-public class?

A public class may be accessed outside of its package. A non-public class may not be accessed outside of its package.

181. To what value is a variable of the boolean type automatically initialized?

The default value of the boolean type is false.

182. Can try statements be nested?

Try statements may be tested.

183. What is the difference between the prefix and postfix forms of the ++ operator?

The prefix form performs the increment operation and returns the value of the increment operation. The postfix form returns the current value all of the expression and then performs the increment operation on that value.

184. What is the purpose of a statement block?

A statement block is used to organize a sequence of statements as a single statement group.

185. What is a Java package and how is it used?

A Java package is a naming context for classes and interfaces. A package is used to create a separate name space for groups of classes and interfaces. Packages are also used to organize related classes and interfaces into a single API unit and to control accessibility to these classes and interfaces.

186. What modifiers may be used with a top-level class?

A top-level class may be public, abstract, or final.

187. What are the Object and Class classes used for?

The Object class is the highest-level class in the Java class hierarchy. The Class class is used to represent the classes and interfaces that are loaded by a Java program.

188. How does a try statement determine which catch clause should be used

to handle an exception?

When an exception is thrown within the body of a try statement, the catch clauses of the try statement are examined in the order in which they appear. The first catch clause that is capable of handling the exception is executed.

The remaining catch clauses are ignored.

189. Can an unreachable object become reachable again?

An unreachable object may become reachable again. This can happen when the object's finalize() method is invoked and the object performs an operation which causes it to become accessible to reachable objects.

190. When is an object subject to garbage collection?

An object is subject to garbage collection when it becomes unreachable to the program in which it is used.

191. What method must be implemented by all threads?

All tasks must implement the run() method, whether they are a subclass of Thread or implement the Runnable interface.

192. What methods are used to get and set the text label displayed by a Button object?

getLabel() and setLabel()

193. Which Component subclass is used for drawing and painting?

Canvas

194. What are synchronized methods and synchronized statements?

Synchronized methods are methods that are used to control access to an object. A thread only executes a synchronized method after it has acquired the lock for the method's object or class. Synchronized statements are similar to synchronized methods. A synchronized statement can only be executed after a thread has acquired the lock for the object or class referenced in the synchronized statement.

195. What are the two basic ways in which classes that can be run as threads

may be defined?

A thread class may be declared as a subclass of Thread, or it may implement the Runnable interface.

196. What are the problems faced by Java programmers who don't use layout managers?

Without layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints imposed by each windowing system.

197. What is the difference between an if statement and a switch statement?

The if statement is used to select among two alternatives. It uses a boolean expression to decide which alternative should be executed. The switch statement is used to select among multiple alternatives. It uses an int expression to determine which alternative should be executed.

198. What happens when you add a double value to a String?

The result is a String object.

199. What is the List interface?

The List interface provides support for ordered collections of objects.

important question at the time of hr interview and there ansewrs

1. Tell me about yourself:

The most often asked question in interviews. You need to have a short statement prepared in your mind. Be careful that it does not sound rehearsed. Limit it to work-related items unless instructed otherwise. Talk about things you have done and jobs you have held that relate to the position you are interviewing for. Start with the item farthest back and work up to the present.

2. Why did you leave your last job?

Stay positive regardless of the circumstances. Never refer to a major problem with management and never speak ill of supervisors, co- workers or the organization. If you do, you will be the one looking bad. Keep smiling and talk about leaving for a positive reason such as an opportunity, a chance to do something special or other forward- looking reasons.

3. What experience do you have in this field?

Speak about specifics that relate to the position you are applying for. If you do not have specific experience, get as close as you can.

4. Do you consider yourself successful?

You should always answer yes and briefly explain why. A good explanation is that you have set goals, and you have met some and are on track to achieve the others.

Your Ad Here

5. What do co-workers say about you?

Be prepared with a quote or two from co-workers. Either a specific statement or a paraphrase will work. Jill Clark, a co-worker at Smith Company, always said I was the hardest workers she had ever known. It is as powerful as Jill having said it at the interview herself.

6. What do you know about this organization?

This question is one reason to do some research on the organization before the interview. Find out where they have been and where they are going. What are the current issues and who are the major players?

7. What have you done to improve your knowledge in the last year?

Try to include improvement activities that relate to the job. A wide variety of activities can be mentioned as positive self-improvement. Have some good ones handy to mention.

8. Are you applying for other jobs?

Be honest but do not spend a lot of time in this area. Keep the focus on this job and what you can do for this organization. Anything else is a distraction.

9. Why do you want to work for this organization?

This may take some thought and certainly, should be based on the research you have done on the organization. Sincerity is extremely important here and will easily be sensed. Relate it to your long-term career goals.

10. Do you know anyone who works for us?

Be aware of the policy on relatives working for the organization. This can affect your answer even though they asked about friends not relatives. Be careful to mention a friend only if they are well thought of.

11. What kind of salary do you need?
A loaded question. A nasty little game that you will probably lose if you answer first. So, do not answer it. Instead, say something like, That's a tough question. Can you tell me the range for this position? In most cases, the interviewer, taken off guard, will tell you. If not, say that it can depend on the details of the job. Then give a wide range.

12. Are you a team player?
You are, of course, a team player. Be sure to have examples ready. Specifics that show you often perform for the good of the team rather than for yourself are good evidence of your team attitude. Do not brag, just say it in a matter-of-fact tone. This is a key point.

13. How long would you expect to work for us if hired?

Specifics here are not good. Something like this should work: I'd like it to be a long time. Or As long as we both feel I'm doing a good job.

14. Have you ever had to fire anyone? How did you feel about that?

This is serious. Do not make light of it or in any way seem like you like to fire people. At the same time, you will do it when it is the right thing to do. When it comes to the organization versus the individual who has created a harmful situation, you will protect the organization. Remember firing is not the same as layoff or reduction in force.

15. What is your philosophy towards work?

The interviewer is not looking for a long or flowery dissertation here. Do you have strong feelings that the job gets done? Yes. That's the type of answer that works best here. Short and positive, showing a benefit to the organization.

16. If you had enough money to retire right now, would you?

Answer yes if you would. But since you need to work, this is the type of work you prefer. Do not say yes if you do not mean it.

17. Have you ever been asked to leave a position?

If you have not, say no. If you have, be honest, brief and avoid saying negative things about the people or organization involved.

18. Explain how you would be an asset to this organization.

You should be anxious for this question. It gives you a chance to highlight your best points as they relate to the position being discussed. Give a little advance thought to this relationship.

19. Why should we hire you?

Point out how your assets meet what the organization needs. Do not mention any other candidates to make a comparison.

20. Tell me about a suggestion you have made.

Have a good one ready. Be sure and use a suggestion that was accepted and was then considered successful. One related to the type of work applied for is a real plus.

21. What irritates you about co-workers?

This is a trap question. Think real hard but fail to come up with anything that irritates you. A short statement that you seem to get along with folks is great.

22. What is your greatest strength?

Numerous answers are good, just stay positive. A few good examples: Your ability to prioritize, Your problem-solving skills, Your ability to work under pressure, Your ability to focus on projects, Your professional expertise, Your leadership skills, Your positive attitude

23. Tell me about your dream job.

Stay away from a specific job. You cannot win. If you say the job you are contending for is it, you strain credibility. If you say another job is it, you plant the suspicion that you will be dissatisfied with this position if hired. The best is to stay genetic and say something like: A job where I love the work, like the people, can contribute and can't wait to get to work.

24. Why do you think you would do well at this job?

Give several reasons and include skills, experience and interest.

25. What are you looking for in a job?

See answer # 23

26. What kind of person would you refuse to work with?

Do not be trivial. It would take disloyalty to the organization, violence or lawbreaking to get you to object. Minor objections will label you as a whiner.

27. What is more important to you: the money or the work?

Money is always important, but the work is the most important. There is no better answer.

28. What would your previous supervisor say your strongest point is?

There are numerous good possibilities:
Loyalty, Energy, Positive attitude, Leadership, Team player, Expertise, Initiative, Patience, Hard work, Creativity, Problem solver

29. Tell me about a problem you had with a supervisor.

Biggest trap of all. This is a test to see if you will speak ill of your boss. If you fall for it and tell about a problem with a former boss, you may well below the interview right there. Stay positive and develop a poor memory about any trouble with a supervisor.

30. What has disappointed you about a job?

Don't get trivial or negative. Safe areas are few but can include:
Not enough of a challenge. You were laid off in a reduction Company did not win a contract, which would have given you more responsibility.

31. Tell me about your ability to work under pressure.

You may say that you thrive under certain types of pressure. Give an example that relates to the type of position applied for.

32. Do your skills match this job or another job more closely?

Probably this one. Do not give fuel to the suspicion that you may want another job more than this one.

33. What motivates you to do your best on the job?

This is a personal trait that only you can say, but good examples are: Challenge, Achievement, Recognition

34. Are you willing to work overtime? Nights? Weekends?

This is up to you. Be totally honest.

35. How would you know you were successful on this job?

Several ways are good measures:
You set high standards for yourself and meet them. Your outcomes are a success.Your boss tell you that you are successful

36. Would you be willing to relocate if required?

You should be clear on this with your family prior to the interview if you think there is a chance it may come up. Do not say yes just to get the job if the real answer is no. This can create a lot of problems later on in your career. Be honest at this point and save yourself uture grief.

37. Are you willing to put the interests of the organization ahead of your own?

This is a straight loyalty and dedication question. Do not worry about the deep ethical and philosophical implications. Just say yes.

38. Describe your management style.

Try to avoid labels. Some of the more common labels, like progressive, salesman or consensus, can have several meanings or descriptions depending on which management expert you listen to. The situational style is safe, because it says you will manage according to the situation, instead of one size fits all.

39. What have you learned from mistakes on the job?

Here you have to come up with something or you strain credibility. Make it small, well intentioned mistake with a positive lesson learned. An example would be working too far ahead of colleagues on a project and thus throwing coordination off.

40. Do you have any blind spots?

Trick question. If you know about blind spots, they are no longer blind spots. Do not reveal any personal areas of concern here. Let them do their own discovery on your bad points. Do not hand it to them.

41. If you were hiring a person for this job, what would you look for?

Be careful to mention traits that are needed and that you have.

42. Do you think you are overqualified for this position?

Regardless of your qualifications, state that you are very well qualified for the position.

43. How do you propose to compensate for your lack of experience?

First, if you have experience that the interviewer does not know about, bring that up: Then, point out (if true) that you are a hard working quick learner.

44. What qualities do you look for in a boss?

Be generic and positive. Safe qualities are knowledgeable, a sense of humor, fair, loyal to subordinates and holder of high standards. All bosses think they have these traits.

45. Tell me about a time when you helped resolve a dispute between others.

Pick a specific incident. Concentrate on your problem solving technique and not the dispute you settled.

46. What position do you prefer on a team working on a project?

Be honest. If you are comfortable in different roles, point that out.

47. Describe your work ethic.

Emphasize benefits to the organization. Things like, determination to get the job done and work hard but enjoy your work are good.

48. What has been your biggest professional disappointment?

Be sure that you refer to something that was beyond your control. Show acceptance and no negative feelings.

49. Tell me about the most fun you have had on the job.

Talk about having fun by accomplishing something for the organization.

50. Do you have any questions for me?

Always have some questions prepared. Questions prepared where you will be an asset to the organization are good. How soon will I be able to be productive? and What type of projects will I be able to assist on? are examples.

And Finally Good Luck