Java J2EE Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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Java J2EE Interview Questions

Questions Answers Views Company eMail

Why use POJO when I can use hashmap

Infotech,

2643

solve this is my problem byte a=40,byte b=50 both add value is 90 this is with in range of byte... byte range is -128to 127.... why this pgm gives error like type mismatch.... package javapgms; public class byte1 { public static void main(String args[]) { byte a=40,b=50; byte c=a+b; System.out.println(c); } } note : dont use int k... a,b,c are in byte range... mind it..

2 6279

Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?

Ericsson,

5 8873

Why method overloading and method overriding required in java?

Ericsson, Wipro,

1 5063

In collection sorting comparable and comparator interface will be used..but why this two interfaces required..two will work same purpose so why there are two interfaces instead of one?when to use comparator and when to use comparable?

Ericsson,

1 4885

What is OOPs & Why?

3 5123

String is mutable or immutable?

3 6767

INTERVIEW QUESTION FOR ANDROID

2139

What collections you have worked on? Internal working of Hashmap?

Bravura Solutions,

1 2820

What design pattern you have used in your project? I answered Factory pattern, how it is implemented? What are its advantage? Do know about Abstract Factory?

Bravura Solutions,

2501

Can static methods be overridden?

Bravura Solutions,

5 9760

what is default length of textfield ?

1 14078

list the types of dialodg

Wipro,

1 3056

java Api provided try catch finally ,try catch(its ok) but why try finally and exception occured at try then how the flow is?

Naaptol,

1 5034

Why java does not supports multiple inheritance?

TCS, VSoft,

3 6141

Un-Answered Questions { Java J2EE }

What is wlst?

1008

How do you write methodology?

982

How is message oriented middleware responsible for no time dependency between sender and receiver component with respect to point to point model on jms?

777

What is a dependency code?

413

How to handle IDOC files?

910

how to create multithreaded program? Explain different ways of using thread? When a thread is created and started, what is its initial state? Or extending thread class or implementing runnable interface. Which is better? : Java thread

1027

What is declaration?

950

What is the difference between java mail and jms queue?

902

Why is java more secure?

926

Difference between association, composition and aggregation?

967

What do you understand by connector? Explain connector architecture.

906

What is class and object in java?

1002

What is a boolean structure?

1082

Explain spring framework?

393

Is java owned by oracle?

1007

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