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 ?

996

What are different types of inner classes ?

985

What is stringjoiner ?

909

Difference between final and effectively final ?

1023

Difference between abstract and concrete class ?

1074

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

1024

Can we access instance variables within static methods ?

1032

What is the use of optional ?

980

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

938

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

930

Similarity and difference between static block and static method ?

871

Difference between class#getinstance() and new operator ?

1137

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

1046

Describe what happens when an object is created in java ?

946

Difference between == and .equals() ?

946

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Un-Answered Questions { Core Java }

Difference between string, string builder, and string buffer?

1020

What are some characteristics of interference class?

944

What about member inner classes?

1038

What will happen if there is a default method conflict as mentioned above and we have specified the same signature method in the base class instead of overriding in the existing class ?

897

Are arrays primitive data types?

1099

What is a line break example?

936

Is java written in c?

911

explain autoboxing in java?

937

What is a marker interface?

1085

What's the access scope of protected access specifier?

987

What is the disadvantage of synchronization?

965

What is difference between hashset and hashmap in java?

937

What do you understand by the term string pool?

956

Can we overload run() method in java?

1117

Are arrays immutable in java?

1003

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