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

Core Java Interview Questions

Questions Answers Views Company eMail

If you are reviewing the code of your team members, what points will you look at, assuming the performance of the application is not so great

KPIT,

2 6284

How will you convert an ArrayList to Arrays?

KPIT,

4 9295

steps to connect with Oracle Databse using TYPE-2 Jdbc driver.

3 11951

what are the methods of an object class?

3 6379

can u give one sinario when you use Abstract Class and When you use Interface.

ITC Infotech,

5 9787

Nullpointer exception is a very common exception. Why is it not made as a checked exception?

Ness Technologies,

2 7788

What is the difference between Checked and Unchecked exception? Give some examples

Ness Technologies,

2 8024

What is the purpose of having the concept of overloading?

Ness Technologies,

7 18701

How does Vector implement synchronization?

Ness Technologies,

4 12400

What is meant by Encapsulation? Can you write a class to explain encapsulation?

Ness Technologies,

8 16659

What is meant by event handling in SAX parser?

Ness Technologies,

1 6232

When you say String is immutable, what do you mean by that? Say I have String s = "Ness" s= s+"Technologies"; What will happen? If the value gets appended, then what is the meaning of immutable here?

Ness Technologies,

5 17139

Java violates few objected oriented concepts. Can you explain in what way?

Ness Technologies,

3 9042

Why java Don't Support Multiple interitence

ABC, Exilant, IBM,

8 14638

In Java why we write public static void main(String args[]) why not main()?

Aptech, GE Healthcare, Infosys, Microsoft, New Horizon, Practical Viva Questions, TCS, Wipro,

46 108880

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Un-Answered Questions { Core Java }

What is the difference between numeric and integer?

1008

List the features of java programming language.

1053

What is better - 'bit-shift a value' or 'multiply by 2'?

1192

how we can create packages in java?

968

What does || || mean in math?

940

Explain the scope of a variable.

1098

Which is better ascii or unicode?

996

Can we create our own wrapper class in java?

970

What are different types of references?

978

Explain about object oriented programming and its features?

1013

How many types of design patterns are there?

1103

Explain java coding standards for interfaces?

1113

What is difference between static class and normal class?

1119

What is yield () in java?

887

What are the advantages of user defined functions?

1004

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