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 method overriding?

1098

What is the difference between an array and an array list?

1037

What is singleton class in java and how can we make a class singleton?

1175

What is the difference between equals() and == in java?

986

Differentiate between static and non-static methods in java.

1070

What is java string pool?

1019

What is a constructor overloading in java?

1059

What is a classloader in java?

1044

What is the difference between break and continue statements?

1055

What are the differences between heap and stack memory in java?

1073

What do you mean by an interface in java?

1043

Explain public static void main(string args[]) in java.

1007

What is an object in java and how is it created?

1071

What is collection class in java? List down its methods and interfaces.

980

What are the different types of inheritance in java?

1007

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Un-Answered Questions { Core Java }

Can private class be inherited in java?

1044

Enlist few advantages of inheritance?

1089

Why array is used in java?

986

How to optimize the javac output?

1057

What are the advantages of java inner classes?

1084

What is size () in java?

1109

What is Applet Stub Interface ?

2513

What is the tradeoff between using an unordered array versus an ordered array?

1254

What is jee6?

1132

What is the difference between interface & abstract class?

1061

Explain when classnotfoundexception will be raised ?

1057

For ease of programming you can consider the maze as a 2D array with colors represented by below integer and characters (in capital letters). • B - Black • W -White • G- Green • R- Red R B W B W W W W W W B W B B W W W W W W W B W B W W W B W W W W B B W W W B W W W B W W B B B B W B W B W W B W W W B W W W B B B W W B W W W B W W B W B W W W B W B W W W W B B W W W W B W W W W W G Shortest Route Problem: • Solution that finds the shortest Route between Red and Green  White will have 1 Weight.  Red and Green carry no weights.  Shortest path is the path with less weight when you add up the weights in the path.

2026

What are the types of literals?

1210

What happens to the Exception object after handling an exception?

2389

What is thread safe singleton?

967

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