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

Core Java Interview Questions

Questions Answers Views Company eMail

What are integer overflows and underflows and how to handle them?

Wipro,

3 12310

What Method and class used for Connection pooling ?

TCS, Wipro,

5 11533

Name the methods in mouse listeners ?

4 6448

Name the class that used to read objects directly from a stream?

Wipro,

4 9186

What are null interfaces in JAVA ? and give me some examples?

5 19597

Explain Global variables in Packages?

4 8387

Explain about GridBag Layout?

1 4432

What is HashTable?

4 12686

what is Dictionary? and what purpose it is used for?

3 6487

Have you used any version control ? if so explain about it?

2 6319

How OOPS concept is achieved in Java?

Cognizant, JPMorgan Chase, Xavient,

6 25274

How are Java source code files named?

3 8892

How are Observer and Observable used?

3 7471

How are commas used in the initialization and iteration parts of a for statement?

2 5989

Explain about global variables in Java?

3 9388

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Un-Answered Questions { Core Java }

How to provide security in java

2278

Explain different forms of polymorphism?

1149

What is square root in java?

1109

Explain covariant method overriding in java.

1106

What does pointer mean?

1063

What does split function do in java?

1021

Is math class static in java?

1122

What is the use of StringTokenizer class?

1070

What is double checked locking in singleton?

1058

How do you override a variable in java?

1149

What is logical variable?

980

Difference between static and dynamic class loading.

1124

What are the disadvantages of object oriented programming?

1278

What is difference between next () and nextline () in java?

992

Can you explain inner class.

1088

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