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?

1007

What are java packages?

984

What are the performance implications of interfaces over abstract classes?

1 3602

How can you generate random numbers in java?

992

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

1194

How can an exception be thrown manually by a programmer?

939

How we can execute any code even before main method?

1087

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

962

Why strings in java are called as immutable?

953

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

951

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

966

How can we use primitive data types as objects?

910

Can variables be used in java without initialization?

1027

What is an infinite loop?

2 1151

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

1030

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Un-Answered Questions { Core Java }

What is generics in java interview questions?

1012

What is casting in java programming?

980

What is the difference between length and length() method in java?

1061

Can an object be null?

915

What is Enum in Java?

1223

What is Classloader in Java?

1147

What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement?

1049

What do you understand by java virtual machine?

1127

What is the largest data type in java?

933

What is the difference between the prefix and postfix forms of the ++ operator?

974

Can we use string in switch case in java?

1008

Why is flag used in java?

1002

What is the basic concepts of OOPS?

1141

what is abstract class in Java?

1076

When throws keyword is used?

956

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