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 3721

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

Agiline, FINO PayTech, HCL,

2 3924

Describe OOP in java?

Syntel,

2 4293

What is difference between overloading and overriding?

Accenture,

2 5190

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

Virtusa,

1 4023

How do we make a class serialize?

Syntel,

3 4563

What is serialVersionUID and what is its need?

KPIT,

1 3750

What is deserialization and how do we do deserialization?

Synechron,

3 4829

What is difference between compatible and incompatible changes in serialization?

Synechron,

1 4317

What is Difference between Serializable and Externalizable in Java serialization?

Cognizant, IBM,

1 4112

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

IBM,

4 5456

How is object created in java?

Cap Gemini,

5 6497

What is the life-cycle of an object?

Broadridge, Syntel,

2 7498

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

SunGard,

3 5051

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

Accenture, iGate, IntoNET, Value Labs,

5 6109

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Un-Answered Questions { Core Java }

What is linked hashmap and its features?

1010

How can we break singleton in java?

971

What is the purpose of garbage collection in java? When is it used?

1048

String and stringbuffer both represent string objects. Can we compare string and stringbuffer in java?

981

What is java and its types?

1098

What is the function of character?

1053

What are default methods ?

1048

Can you instantiate the math class?

1061

Why we go for collections in java?

982

Explain some best practices you would apply while using collection in java?

1039

What are the advantages of arraylist over arrays?

1092

I don’t want my class to be inherited by any other class. What should I do?

1015

describe method overloading

1023

Is java hard to learn?

918

What is immutable class in java?

949

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