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 ?

1061

What are different types of inner classes ?

1054

What is stringjoiner ?

957

Difference between final and effectively final ?

1107

Difference between abstract and concrete class ?

1174

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

1086

Can we access instance variables within static methods ?

1094

What is the use of optional ?

1035

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

988

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

991

Similarity and difference between static block and static method ?

919

Difference between class#getinstance() and new operator ?

1208

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

1107

Describe what happens when an object is created in java ?

1009

Difference between == and .equals() ?

1001

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Un-Answered Questions { Core Java }

What is a char in java?

1039

How does regex work?

964

Why declare Main() method as a static in java ?

1078

What is tostring () method?

1032

Is set thread safe java?

923

How do you differentiate abstract class from interface?

961

What is a cup of java?

1018

What is the difference between access specifiers and access modifiers in java? 16

1000

What is the difference between multiple processes and multiple threads?

1210

What is the difference between superclass and subclass?

1175

what is deadlock? : Java thread

1009

Give some features of interface?

1067

What is hash code collision?

1048

What are unchecked exceptions in java?

1038

What is an object class?

1026

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