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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 3804

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

Agiline, FINO PayTech, HCL,

2 4015

Describe OOP in java?

Syntel,

2 4378

What is difference between overloading and overriding?

Accenture,

2 5291

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

Virtusa,

1 4097

How do we make a class serialize?

Syntel,

3 4720

What is serialVersionUID and what is its need?

KPIT,

1 3854

What is deserialization and how do we do deserialization?

Synechron,

3 4957

What is difference between compatible and incompatible changes in serialization?

Synechron,

1 4408

What is Difference between Serializable and Externalizable in Java serialization?

Cognizant, IBM,

1 4182

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

IBM,

4 5592

How is object created in java?

Cap Gemini,

5 6647

What is the life-cycle of an object?

Broadridge, Syntel,

2 7587

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

SunGard,

3 5147

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

Accenture, iGate, IntoNET, Value Labs,

5 6286


Post New Core Java Questions

Un-Answered Questions { Core Java }

Write an algorithm program in java for the following question.. In a VLSI design techniques,they used rectangles to design circuits. EVery rectangle is to be placed according to x,y coordinates. Check whether or not two rectangles overlap each other. Here overlapping of rectangles is acceptable, if 1) one rectangle intersect with other. 2) one rectangle fully covers other. The time of algorithm should not exceed o(n logn).

2776


Explain how to convert any java object into byte array.

1014


What is the nested interface?

1165


Define jre i.e. Java runtime environment?

1082


Explain notifyall() method of object class ?

1140


When will you define a method as static?

1142


Is java based on c?

1050


Explain abstract class in java?

1130


Is empty list java?

975


What is mean by encoding?

1124


What is null mean in java?

1149


What are the basic interfaces of java collections framework?

1180


What is static block?

1187


What is comparable and comparator interface? List their differences

1152


What is dot operator?

1094