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Core Java Interview Questions
Questions Answers Views Company eMail

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

Avaya,

1 2807

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

Agiline, FINO PayTech, HCL,

2 2965

Describe OOP in java?

Syntel,

2 3306

What is difference between overloading and overriding?

Accenture,

2 3971

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

Virtusa,

1 3172

How do we make a class serialize?

Syntel,

3 3378

What is serialVersionUID and what is its need?

KPIT,

1 2889

What is deserialization and how do we do deserialization?

Synechron,

3 3616

What is difference between compatible and incompatible changes in serialization?

Synechron,

1 3466

What is Difference between Serializable and Externalizable in Java serialization?

Cognizant, IBM,

1 3350

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

IBM,

4 3923

How is object created in java?

Cap Gemini,

5 4947

What is the life-cycle of an object?

Broadridge, Syntel,

2 6320

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

SunGard,

3 3843

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

Accenture, iGate, IntoNET, Value Labs,

5 4512

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Un-Answered Questions { Core Java }

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?

617

What does three dots mean in java?

640

What is the use of jtable?

639

How do you reverse a list?

544

How can we find the actual size of an object on the heap?

796




What does system.gc() and runtime.gc() methods do?

592

What is difference between this and super keyword?

504

What is sortedset in java?

562

What is the difference between iterator and list iterator?

525

What is singleton pattern?

546

Differentiate jar and war files?

584

How do you check if a string contains only numeric digits?

608

What is difference between length and length() method in java ?

550

What is the purpose of default constructor?

568

What is difference between jdk,jre and jvm?

556

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