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 ?

1099

What are different types of inner classes ?

1099

What is stringjoiner ?

1003

Difference between final and effectively final ?

1171

Difference between abstract and concrete class ?

1262

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

1131

Can we access instance variables within static methods ?

1150

What is the use of optional ?

1085

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

1028

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

1049

Similarity and difference between static block and static method ?

969

Difference between class#getinstance() and new operator ?

1273

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

1153

Describe what happens when an object is created in java ?

1063

Difference between == and .equals() ?

1035

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Un-Answered Questions { Core Java }

how to convert Java project into Maven ?

1105

What is polymorphism and what are the types of it?

1037

What are classloaders?

1080

What is the difference between interface & abstract class?

1081

Is an integer an object?

1027

Differentiate between class and structure.

1177

What are data types in programming?

1036

What is the protected method modifier?

1085

Explain the init method?

1031

What is string [] args?

1055

How does linkedlist work in java?

988

Can we declare a class as abstract without having any abstract method?

1041

Explain about core java?

1188

What does it mean to flush a file?

1110

What is the default access specifier for variables and methods of a class?

1251

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