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 12297

What Method and class used for Connection pooling ?

TCS, Wipro,

5 11495

Name the methods in mouse listeners ?

4 6430

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

Wipro,

4 9164

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

5 19576

Explain Global variables in Packages?

4 8363

Explain about GridBag Layout?

1 4427

What is HashTable?

4 12665

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

3 6472

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

2 6306

How OOPS concept is achieved in Java?

Cognizant, JPMorgan Chase, Xavient,

6 25248

How are Java source code files named?

3 8871

How are Observer and Observable used?

3 7459

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

2 5969

Explain about global variables in Java?

3 9368

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Un-Answered Questions { Core Java }

What is the full name of java?

1114

What is the use of generics? When was it added to the Java development Kit?

1014

Why unicode is important?

934

What is null mean in java?

1089

How many bits is a float?

1002

Can a class be final?

936

How are variables stored in memory?

1063

What are the three best choices for a development environment?

1110

what is method reference in java 8?

1032

What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement?

1102

How many decimal places is a double?

988

How to sort list of list in java?

1089

What is thread synchronization in java?

890

Why do we need data serialization?

986

Explain why wait(), notify() and notifyall() methods are in object class rather than in the reading class?

970

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