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

Core Java Interview Questions

Questions Answers Views Company eMail

Can we declare Pointer in Java?

5 1643

What is the default value stored in Local Variables?

5 1558

Difference in the use of print, println, and printf.

5 1304

Is it possible to make an array volatile?

4 1440

What is an object-oriented paradigm?

5 1521

What are the Memory Allocations available in JavaJava?

1 767

What is a singleton class in Java? And How to implement a singleton class?

2 901

Can you explain the Java thread lifecycle?

1 894

In the below Java Program, how many objects are eligible for garbage collection?

1 1051

What is JDK? Mention the variants of JDK?

1 892

What are Brief Access Specifiers and Types of Access Specifiers?

1 864

Explain Method Overloading in Java.

1 972

Give a briefing on the life cycle of a thread.

1 886

Brief the life cycle of an applet.

1 723

What are the observer and observable classes?

1 1045

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Un-Answered Questions { Core Java }

Is nan false?

974

What is dynamic array in java?

1021

What is unmodifiable list in java?

953

Is stringwriter thread safe?

994

How can we make a class singleton?

1062

What is length in java?

1010

Which collection does not allow duplicates in java?

974

What is the meaning of I ++ in java?

1173

Which is fastest collection in java?

1075

How many types of keywords are there?

990

What is an object class?

1023

What is classname class in java?

1056

Which software is used for java programming?

1016

Can we extend singleton class in java?

959

What is Java Reflection API? Why it’s so important to have?

1155

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