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

Core Java Interview Questions

Questions Answers Views Company eMail

Can I use % with real numbers?

1025

Why is the type for real numbers called double?

963

Explain when we should make an instance variable private.

1130

What is finalize()?

1200

When should we create our own custom exception classes?

1023

Can we pass a primitive type by reference in java? How

945

When do I need to use reflection feature in java?

1088

Why does java have two ways to create child threads? Which way is better?

1054

Why does java have different data types for integers and floating-point values?

1021

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

1138

Is finalize() similar to a destructor?

1026

Explain the difference between protected and default access.

1004

Explain how to convert any java object into byte array.

980

What is finalize()? Is finalize() similar to a destructor?

965

Explain the use of shift operator in java. Can you give some examples?

979

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Un-Answered Questions { Core Java }

Write an algorithm for quick sort?

1040

Is char a method in java?

1073

What is the class in java?

1022

What is a map? What are the implementations of map?

1095

What is instanceof keyword?

1221

Is null a string or object in java?

973

Which collection is best for sorting in java?

1131

What is string [] args?

1012

How does indexof work?

967

How can a gui component handle its own events in java programming?

1050

Why heap memory is called heap?

1050

What is size_t?

987

Explain about sets?

1033

What are the advantages of exception handling?

1066

How do I type unicode?

986

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