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

Core Java Interview Questions

Questions Answers Views Company eMail

Why is the main method declared static?

1143

I don’t want my class to be inherited by any other class. What should I do?

1017

Can an interface implement another interface?

1042

What do you understand by private, protected and public?

1041

Which oo concept is achieved by using overloading and overriding?

1016

A non-static inner class may have object instances that are associated with instances of the class’s outer class. A static inner class does not have any object instances.

1021

What is the purpose of declaring a variable as final?

973

What is a marker interface?

1 1171

Can a abstract class be declared final?

1009

What are instance variables?

1086

What is the difference between method overriding and overloading?

1238

Can a method inside a interface be declared as final?

1008

Can a main method be overloaded?

1027

Can a method be overloaded based on different return type but same argument type?

973

What are local variables?

1056

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Un-Answered Questions { Core Java }

What is the difference between static binding and dynamic binding?

1136

What is join () in java?

968

What happens when a thread cannot acquire a lock on an object in java programming?

1024

What is the difference between size and length in java?

981

how to create multithreaded program? Explain different ways of using thread? When a thread is created and started, what is its initial state? Or extending thread class or implementing runnable interface. Which is better? : Java thread

1040

Why are the destructors for base class and derived class called in reverse order when the program exits

2215

Convert Binary tree to linked list.

1098

what is the difference between Object Based Language and Object Oriented Language?

1040

Can a top level class be private or protected?

1057

Can we clone singleton class in java?

967

Why synchronization is important?

1033

what state does a thread enter when it terminates its processing? : Java thread

1056

What is a variable and constant?

1012

Is finalize() similar to a destructor?

1026

What is javac_g?

1018

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