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

Core Java Interview Questions

Questions Answers Views Company eMail

What is covariant return type?

1115

Explain different forms of polymorphism?

1150

Is there any difference between synchronized methods and synchronized statements?

1099

Tell us something about an iterator.

963

Write a code to show a static variable?

1092

What is super?

1166

Can we declare a static variable inside a method?

1002

What do you understand by soft reference?

1056

If a class is declared without any access modifiers, where can the class be accessed?

1066

What is instance synchronization?

1048

What is callablestatement? How you can call stored procedure to pass in parameter?

1025

Are the imports checked for validity at compile time? Will the code containing an import such as java.lang.abcd compile?

1105

What is the common usage of serialization?

1148

What is a prefix function.write down a code to compute prefix function.

1058

What are some alternatives to inheritance?

1104

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Un-Answered Questions { Core Java }

Explain illegalmonitorstateexception and when it will be thrown?

1101

What is rmi and steps involved in developing an rmi object?

1065

Difference between keyword and identifier.

1034

How do you remove duplicates in java?

1020

What is the static import?

1106

If system.exit (0); is written at the end of the try block, will the finally block still execute?

1111

Does printwriter create a file?

962

How to print nodes of a Binary tree?

2251

List any five features of java?

1031

How many inner classes can a class have?

1045

How many types of equations are there?

1018

How can you make sure that your singleton class will always return single instance in multi-threaded environment?

1028

What is the exact difference in between Unicast and Multicast object? Where will it be used?

1060

What is the purpose of final keyword and when to use it?

1004

What is arraylist e in java?

1061

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