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 the purpose of static methods and static variables?

1071

What are java packages?

1033

What are the performance implications of interfaces over abstract classes?

1 3666

How can you generate random numbers in java?

1049

When a lot of changes are required in data, which one should be a preference to be used? String or stringbuffer?

1240

How can an exception be thrown manually by a programmer?

1003

How we can execute any code even before main method?

1141

Can we call a non-static method from inside a static method?

998

Why strings in java are called as immutable?

992

What is the difference between an inner class and a sub-class?

1018

Is it compulsory for a try block to be followed by a catch block in java for exception handling?

1014

How can we use primitive data types as objects?

961

Can variables be used in java without initialization?

1085

What is an infinite loop?

2 1255

What is an infinite loop? How infinite loop is declared?

1111

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Un-Answered Questions { Core Java }

What is the difference between overriding & overloading?

1072

What is static import in java?

986

Mention the default values of all the elements of an array defined as an instance variable.

985

What is the purpose of the System class?

1002

What is a dynamic array java?

949

Explain oops concepts in detail?

1029

Can we convert stringbuffer to string?

1010

What are the different types of inheritance in java?

991

Why is singleton class used?

1036

Why hashset is used in java?

1075

I want my class to be developed in such a way that no other class (even derived class) can create its objects. How can I do so?

983

What is the difference between a synchronized method and a synchronized block?

1072

What is the purpose of an interface?

1045

Is java ee a framework?

989

What is api in java?

982

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