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 ?

1006

What are different types of inner classes ?

995

What is stringjoiner ?

918

Difference between final and effectively final ?

1030

Difference between abstract and concrete class ?

1089

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

1032

Can we access instance variables within static methods ?

1044

What is the use of optional ?

991

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

949

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

941

Similarity and difference between static block and static method ?

882

Difference between class#getinstance() and new operator ?

1154

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

1056

Describe what happens when an object is created in java ?

955

Difference between == and .equals() ?

956

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Un-Answered Questions { Core Java }

What is the integer of 16?

932

Explain the significance of class loaders in bootstrap?

898

What are drawbacks of singleton class?

917

Write a function to print Fibonacci series and Tribonacci series?

1136

How big is a gigabyte?

1000

5 Coding best practices you learned in java?

986

What is regex used for?

954

Is constructor inherited?

921

What is the difference between the paint() and repaint() methods?

1017

What is difference between final and immutable?

1085

Is zero a natural number?

985

What is illegal identifier in java?

974

What is the use of default method in interface in java? Explain

940

What is difference overloading and overriding?

1095

What are data types in oop?

997

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