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 6184

How will you convert an ArrayList to Arrays?

KPIT,

4 9098

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

3 11838

what are the methods of an object class?

3 6258

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

ITC Infotech,

5 9624

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

Ness Technologies,

2 7691

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

Ness Technologies,

2 7921

What is the purpose of having the concept of overloading?

Ness Technologies,

7 18529

How does Vector implement synchronization?

Ness Technologies,

4 12241

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

Ness Technologies,

8 16401

What is meant by event handling in SAX parser?

Ness Technologies,

1 6147

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 16977

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

Ness Technologies,

3 8923

Why java Don't Support Multiple interitence

ABC, Exilant, IBM,

8 14365

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 107755

Post New Core Java Questions

Un-Answered Questions { Core Java }

Is .net better than java?

975

What do you understand by overloading and overriding in java?

1031

I want to control database connections in my program and want that only one thread should be able to make database connection at a time. How can I implement this logic?

1061

What is string made of?

923

What is qms certification?

911

Is integer a class?

1028

Is ++ operator thread-safe in java?

1125

What are JVM.JRE, J2EE, JNI?

1065

What is the purpose of the System class?

966

What is meant by data hiding in java?

1098

What is the purpose of a transient variable?

1012

How do you use find and replace?

918

Explain the difference between abstract class and interface in java?

947

Write a factorial program using recursion in java?

963

What are the types of inner classes (non-static nested class) used in java?

1025

For More Un-Answered { Core Java } Questions Click Here