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 are the methods of object class ?

1063

What are different types of inner classes ?

1054

What is stringjoiner ?

965

Difference between final and effectively final ?

1109

Difference between abstract and concrete class ?

1181

Can we create an object if a class doesn't have any constructor ( not even the default provided by constructor ) ?

1090

Can we access instance variables within static methods ?

1100

What is the use of optional ?

1036

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

988

Difference between final and effectively final ? Why is effectively final even required ?

994

Similarity and difference between static block and static method ?

919

Difference between class#getinstance() and new operator ?

1213

What is a lambda expression ? What's its use ?

1110

Describe what happens when an object is created in java ?

1010

Difference between == and .equals() ?

1006

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Un-Answered Questions { Core Java }

What is the use of math abs in java?

1012

What is difference between module and function?

1187

What is the difference between preemptive scheduling and time slicing in java programming?

1022

What is java instanceof operator?

1047

Who is founder of java?

999

Give us the name of the list layoutmanagers in java?

927

What is difference between iterator access and index access?

1064

How finally used under exception handling?

948

What is the purpose of the System class?

1004

Name few "optional" classes introduced with java 8 ?

1140

Why does java not support pointers?

1110

How do you replace all in word?

1068

Can you call a method on a null object?

1011

Which class is the superclass for every class in java programming?

1000

How can I become a good programmer?

983

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