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Core Java Interview Questions
Questions Answers Views Company eMail

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

Wipro,

3 10143

What Method and class used for Connection pooling ?

TCS, Wipro,

5 7830

Name the methods in mouse listeners ?

4 3963

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

Wipro,

4 6521

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

5 16029

Explain Global variables in Packages?

4 5026

Explain about GridBag Layout?

1 3032

What is HashTable?

4 9739

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

3 4329

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

2 4762

How OOPS concept is achieved in Java?

Cognizant, JPMorgan Chase, Xavient,

6 19950

How are Java source code files named?

3 6404

How are Observer and Observable used?

3 5180

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

2 4101

Explain about global variables in Java?

3 7286


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Un-Answered Questions { Core Java }

java program with complete 4 oops concepts implemented example

2398


How do you clear an arraylist in java?

164


Can we override the static methods?

207


Can you explain the final method modifier?

213


Can you give names of Container classes?

1506






Explain the importance of finally over return statement?

260


Is math class static in java?

180


explain local datetime api in java8?

196


Can you start a thread twice in Java?

247


What is a parameter in matrices?

173


Does list maintain insertion order java?

191


What is are packages?

225


How many return statement are allowed in a function?

150


How to reverse string in java?

222


Which is better stringbuffer or stringbuilder?

184