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?

965

What are the main concepts of oops in java?

4 1793

Why java strings are immutable in nature?

1088

Is there a case when finally will not execute?

1026

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

1112

What are the different types of garbage collectors in java?

1159

What is a finally block?

998

What are the two ways to create a thread?

1023

Can we write multiple catch blocks under single try block?

1109

What are the differences between processes and threads?

1080

How to create a custom exception?

1009

What is exception hierarchy in java?

1033

What is difference between overloading and overriding in java?

1043

What is difference between iterator and enumeration in java?

1010

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

1153

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Un-Answered Questions { Core Java }

What are constants and how to create constants in java?

1002

What is blank final variable?

1081

What is use of static method?

1073

What is the difference between && and & in java?

1097

Is set ordered in java?

997

Which methods cannot be overridden in java?

1009

What are synchronized blocks in java?

1204

What are the methods to rectify ambiguities in the interfaces in JAVA?

1108

Are arrays dynamic in java?

1053

When would you use a static class?

998

How can we create objects if we make the constructor private ?

1039

How big is a 32 bit integer?

1067

Explain about varargs in java?

1146

Difference between throw and throws?

1129

How many types of variables are there?

1149

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