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

Core Java Interview Questions

Questions Answers Views Company eMail

Difference between Web-based applications,Client- Server applications and Distributed applications?

Infosys,

3 13736

Catch(Exception e){ } in that what is Exception and purpose of that in that place exactly?

3 5098

what is the diff between Servletcontext and servletconfig?

5 7357

how many access specifiers are available in java

11 23555

How many objects are created for a singleton class

Ness Technologies,

7 15042

How to sort the elements in HashMap

Ness Technologies,

3 11948

What is non static block in java

Emphasis, Ness Technologies,

10 24160

How to synchonise HashMap

IBM,

4 8114

Program to output as below formate: 1 2 3 4 5 6 7 8 9 10

Huawei,

4 8179

Program to find greatest prime number in n numbers?

Huawei,

3 16006

program to validate the IP address? Validity range should be 0 to 255

Huawei,

1 10755

question on Thread synchronization

Huawei,

3 10330

diff b/w sleep(1000) and wait(1000)?

Huawei,

4 21277

WHAT IS THE MEANING OF ALL TYPE OF BUZZWORDS?

4 14502

who can we create the object of a class? in how many ways we can create it (max 5)

2 5709

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Un-Answered Questions { Core Java }

Which is better singleton or static class?

1033

Can we override compareto method?

997

What are the advantages of packages in java?

1761

What is memory leak and how does java handle it?

1034

What is serialization in java?

1115

What is the purpose of abstract class?

1065

If you do not want your class to be inherited by any other class. What would you do?

1077

What initialize variables?

1092

What are java annotations?

1234

What is parsing and its types?

1196

What is the set interface in java programming?

1291

Can java arraylist hold different types?

1159

Who is founder of java?

1045

What is the difference between variable declaration and variable initialization?

1107

Explain notify() method of object class ?

1169

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