Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Differentiate between the constructors and methods in java?

952

What are the main concepts of oops in java?

4 1753

Why java strings are immutable in nature?

1077

Is there a case when finally will not execute?

1010

What purpose do the keywords final, finally, and finalize fulfill?

1095

What are the different types of garbage collectors in java?

1142

What is a finally block?

987

What are the two ways to create a thread?

1009

Can we write multiple catch blocks under single try block?

1089

What are the differences between processes and threads?

1068

How to create a custom exception?

996

What is exception hierarchy in java?

1014

What is difference between overloading and overriding in java?

1029

What is difference between iterator and enumeration in java?

1001

What is difference between calling start() and run() method of thread?

1134

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Un-Answered Questions { Core Java }

What will happen to the exception object after exception handling?

996

What is unicode full form?

983

extending thread class or implementing runnable interface. Which is better? : Java thread

1002

Can array grow dynamically in java?

988

Which number is denoted by leading zero in java?

1245

Does substring create a new object?

1001

What is meant by class and object in java?

1047

What does serializing data mean?

946

What is mean by collections in java?

1183

Can java cast null?

1043

What is the difference between instanceof and isinstance?

1063

EDS (Electronic Data Systems India Pvt Ltd) at Chennai on 16-12-2006.

9211

What is garbage collection? Can it be forced to run?

1012

Is arraylist zero based?

1075

What is a nested list?

969

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