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 3665

How can you generate random numbers in java?

1048

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?

1140

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

998

Why strings in java are called as immutable?

991

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

1016

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

1013

How can we use primitive data types as objects?

961

Can variables be used in java without initialization?

1081

What is an infinite loop?

2 1255

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

1109

Post New Core Java Questions

Un-Answered Questions { Core Java }

What is the difference between static (class) method and instance method?

1082

How do I run java on windows?

1173

What is final access modifier in java?

1147

Explain 5 io best practices?

1032

Explain heap sort?

1120

How can you share data between two thread in Java?

945

Does java list allow null?

988

What is size of int in java?

1062

What is proper subset?

975

Can we call thread start () twice?

963

Write a java program to find the route that connects between Red and Green Cells. General Rules for traversal 1. You can traverse from one cell to another vertically, horizontally or diagonally. 2. You cannot traverse through Black cells. 3. There should be only one Red and Green cell and at least one of each should be present. Otherwise the array is invalid. 4. You cannot revisit a cell that you have already traversed. 5. The maze need not be in the same as given in the above example

2601

What are computer functions?

945

What do you understand by overloading and overriding in java?

1081

What is a substitution variable?

1029

How java is similar to c?

1053

For More Un-Answered { Core Java } Questions Click Here