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?

1034

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?

1019

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?

1086

What is an infinite loop?

2 1256

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

1111

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Un-Answered Questions { Core Java }

How does a cookie work in Servlets?

844

What is the Scope of Static Variable?

1235

How to declare objects of a class ?

1078

Why is singleton instance static?

997

What does a method signature consist of?

984

What is thread pool? How can we create thread pool in java?

1070

What are streams in java 8?

1005

What restrictions are placed on method overriding in java programming?

1003

What is string immutability?

1107

What is an example of declaration?

1009

What is a boolean structure?

1089

What is the java project architecture?

2245

how do I create a runnable with inheritance? : Java thread

981

In a container there are 5 components. I want to display the all the components names, how will you do that one?

1044

What is a ternary operator in java?

982

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