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

Core Java Interview Questions

Questions Answers Views Company eMail

Are the equals() and hashCode() protected methods of object class?

Avaya,

1 3603

What are the uses of final, finally and finalize in java?

Agiline, FINO PayTech, HCL,

2 3813

Describe OOP in java?

Syntel,

2 4178

What is difference between overloading and overriding?

Accenture,

2 5042

Why do we need main method to execute a java program?

Virtusa,

1 3932

How do we make a class serialize?

Syntel,

3 4443

What is serialVersionUID and what is its need?

KPIT,

1 3645

What is deserialization and how do we do deserialization?

Synechron,

3 4667

What is difference between compatible and incompatible changes in serialization?

Synechron,

1 4222

What is Difference between Serializable and Externalizable in Java serialization?

Cognizant, IBM,

1 4019

What is an object in Java and what are its benefits?

IBM,

4 5293

How is object created in java?

Cap Gemini,

5 6315

What is the life-cycle of an object?

Broadridge, Syntel,

2 7365

why static class in java or what is use of static class in java

SunGard,

3 4902

Tell me the programme for this @ 1 2 @ @ @ 1 2 3 4

Accenture, iGate, IntoNET, Value Labs,

5 5922

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Un-Answered Questions { Core Java }

Why is static used?

987

What are the differences between heap and stack memory?

1031

How objects of a class are created if no constructor is defined in the class?

1024

What is a final class in java?

971

What is the access scope of a protected method?

964

What is the purpose of void?

955

Explain scope or life time of local variables in java?

979

What classes of exceptions may be thrown by a throw statement?

919

What are the different types of inner classes?

975

What is boolean strategy?

1088

What is byte code and why is it important to java’s use for internet programming?

1063

What is the mapping mechanism used by java to identify IDL language?

965

How to use Media tracker Class.

1087

When is an object subject to garbage collection?

1003

Is logger a singleton?

899

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