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 we declare the main method of our class as private?

958

What are loops in java? What are three types of loops?

992

What are java packages? What's the significance of packages?

1233

In java, how we can disallow serialization of variables?

949

What are loops in java?

2 1173

Why runnable interface is used in java?

1062

How garbage collection is done in java?

1000

There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

1439

What is the base class in java from which all classes are derived?

931

Can we declare a class as abstract without having any abstract method?

958

Which of the following classes will have more memory allocated?

978

Does importing a package imports its sub-packages as well in java?

934

How objects of a class are created if no constructor is defined in the class?

1025

Give an example of use of pointers in java class.

975

I want to persist data of objects for later use. What is the best approach to do so?

1009

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Un-Answered Questions { Core Java }

What is integer valueof?

1057

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

1006

What is a instance variable in java?

991

What are the four versions of java?

972

What is meant by singleton class?

991

What is an enumeration?

1012

What is array list in java?

1031

What is the difference between instanceof and isinstance?

995

Can we return null in java?

1076

What is module in oop?

965

Can a constructor be made final?

1061

How do you detect memory leaks?

1014

How do you compare two objects?

883

What are the new features in java 8? Explain

920

How do you format in java?

955

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