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 11155

What Method and class used for Connection pooling ?

TCS, Wipro,

5 9429

Name the methods in mouse listeners ?

4 5012

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

Wipro,

4 7683

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

5 17705

Explain Global variables in Packages?

4 6278

Explain about GridBag Layout?

1 3666

What is HashTable?

4 11075

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

3 5237

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

2 5439

How OOPS concept is achieved in Java?

Cognizant, JPMorgan Chase, Xavient,

6 22370

How are Java source code files named?

3 7364

How are Observer and Observable used?

3 6164

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

2 4900

Explain about global variables in Java?

3 8181

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Un-Answered Questions { Core Java }

Can you explain the cs option of java interpreter?

499

What are the uses of synchronized keyword?

549

Difference between collection, collection and collections in java?

562

What do you understand by classes in java?

549

List out benefits of object oriented programming language?

474

Can we override the static method?

564

How will you call an Applet using Java Script Function?

534

Can we override the overloaded method?

555

What is qms certification?

513

Can an interface be final?

539

What is the program compilation process?

579

What is your platform’s default character encoding?

549

What is a singleton puppy?

520

Can a lock be acquired on a class in java programming?

526

What are the 6 boolean operators?

543

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