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 1676

What is the default value stored in Local Variables?

5 1582

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

5 1332

Is it possible to make an array volatile?

4 1447

What is an object-oriented paradigm?

5 1556

What are the Memory Allocations available in JavaJava?

1 781

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

2 915

Can you explain the Java thread lifecycle?

1 907

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

1 1060

What is JDK? Mention the variants of JDK?

1 904

What are Brief Access Specifiers and Types of Access Specifiers?

1 873

Explain Method Overloading in Java.

1 991

Give a briefing on the life cycle of a thread.

1 893

Brief the life cycle of an applet.

1 737

What are the observer and observable classes?

1 1060

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Un-Answered Questions { Core Java }

What is run time allocation?

1024

State two differences between C and Java.

1340

Can we write class inside a class in java?

983

What is the difference between the file and randomaccessfile classes?

1098

How would you convert bytes to string?

988

What is a default constraint?

1070

What comes to mind when someone mentions a shallow copy in java?

1110

What is passing by reference in java?

1023

What do you understand by the term polymorphism?

1081

What about main() method in java ?

1020

What are the restriction imposed on a static method or a static block of code?

1060

Can list contain null in java?

1086

What is jvm? How its run?

1087

How to compare two strings in java program?

1049

Does string isempty check for null?

1025

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