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 12426

What Method and class used for Connection pooling ?

TCS, Wipro,

5 11733

Name the methods in mouse listeners ?

4 6572

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

Wipro,

4 9309

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

5 19759

Explain Global variables in Packages?

4 8532

Explain about GridBag Layout?

1 4532

What is HashTable?

4 12845

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

3 6579

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

2 6421

How OOPS concept is achieved in Java?

Cognizant, JPMorgan Chase, Xavient,

6 25509

How are Java source code files named?

3 8994

How are Observer and Observable used?

3 7606

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

2 6068

Explain about global variables in Java?

3 9477

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Un-Answered Questions { Core Java }

What is the same as procedures?

1035

What is the use of http-tunneling in rmi?

1099

What is the difference between the boolean & operator and the && operator in java programming?

1093

How do you include a string in java?

1053

What do you know about the garbate collector?

1079

How to use arraylist in java netbeans?

1092

Why is stringbuffer not immutable?

1129

Explain about version control?

1090

Where is jre installed?

1088

Does list allow duplicates in java?

975

Define nashorn in java8.

1088

how can you take care of mutual exclusion using java threads? : Java thread

1093

How many types of gc are there in java?

1039

Which collection does not allow duplicates in java?

1025

What is your platform’s default character encoding?

1132

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