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

Core Java Interview Questions

Questions Answers Views Company eMail

Difference between method overloading and method overriding in java ?

1100

Explain about main thread in java?

1097

What access modifiers can be used for class ?

1037

Explain when classnotfoundexception will be raised ?

1055

Explain when noclassdeffounderror will be raised ?

1068

What all methods are used to prevent thread execution ?

1044

What are inner classes or non static nested classes in java?

1193

What are packages in java?

5 1689

Difference between ‘is-a’ and ‘has-a’ relationship in java?

1026

Explain why wait(), notify() and notifyall() methods are in object class rather than in thread class?

1025

Can we override constructors in java?

1157

Can sleep() method causes another thread to sleep?

1057

Explain importance of throws keyword in java?

990

In how many ways we can create threads in java?

1231

Can we have multiple catch block for a try block?

1031

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Un-Answered Questions { Core Java }

What is the difference between compile-time polymorphism and runtime polymorphism?

1013

Explain the term virtual machine?

1061

What is the difference between hashset and treeset in java?

1082

How garbage collection is done in java?

1070

What are the high-level thread states in java programming?

1075

What is parsing in java?

974

Can java arraylist hold different types?

1088

What does the string method compareto () do?

1072

What is final, finally, finalize?

1127

What is void keyword?

1120

What is the purpose of the wait(), notify(), and notifyall() methods in java programming?

1093

What is the reason behind using constructors and destructors?

1082

List down the methods and interfaces of collection class in java.

996

What is a treeset in java?

1061

Explain the hierarchy of java exception classes?

1126

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