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 is an empty class? What functionality does it offer in Java?

Deloitte, EXL, JPMorgan Chase,

1220

Give any two differences between C++ and java.

GrapeCity,

1103

What do you mean by Hash Map and Hash Table?

Atos Origin,

1044

Why is String immutable?

Atos Origin,

1021

What is a local block?

Global Logic,

1080

What do you mean by exception handling in Java?

Atos Origin,

1233

What are dot operator queries?

Atos Origin,

1068

What are annotations in java?

Impetus,

1052

What is the use of a copy constructor?

Flextronics,

967

How we can declare a static variable?

HCL,

1082

Write a function to print Fibonacci series and Tribonacci series?

Hexaware,

1139

How we create object in copy constructor?

HCL,

1081

Do we need to manually write Copy Constructor?

HCL,

997

Why declare Main() inside the class in java ?

HCL,

1006

What is the use of using enum to declare a constant?

Fidelity,

972

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Un-Answered Questions { Core Java }

Explain different forms of polymorphism?

1107

What is vector?

1004

What is the similarity between dynamic binding and linking?

1074

What are synchronized methods ?

1064

What are the pillars of java?

881

Can you call a method on a null object?

980

Are arrays primitive data types?

1116

Can list contain null in java?

1045

Can you explain the usages of class.forname()?

1025

Tell some latest versions in JAVA related areas?

939

explain the concept of virtual method invocation in polymorphism in detail?

2172

What is a modifier?

1442

Can java list be null?

960

How much ram can a 64 bit processor theoretically?

841

What are voids?

922

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