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,

1274

Give any two differences between C++ and java.

GrapeCity,

1147

What do you mean by Hash Map and Hash Table?

Atos Origin,

1096

Why is String immutable?

Atos Origin,

1062

What is a local block?

Global Logic,

1141

What do you mean by exception handling in Java?

Atos Origin,

1295

What are dot operator queries?

Atos Origin,

1104

What are annotations in java?

Impetus,

1095

What is the use of a copy constructor?

Flextronics,

992

How we can declare a static variable?

HCL,

1110

Write a function to print Fibonacci series and Tribonacci series?

Hexaware,

1184

How we create object in copy constructor?

HCL,

1124

Do we need to manually write Copy Constructor?

HCL,

1033

Why declare Main() inside the class in java ?

HCL,

1062

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

Fidelity,

1029

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Un-Answered Questions { Core Java }

Why we used vector class?

1069

What is Applet Stub Interface ?

2495

Are private methods final?

903

What does nullpointerexception mean?

1085

Why does the integer quotient -0/3 yield 0, but the double quotient -0.0/3.0 yields – 0.0?

1050

Is stringwriter thread safe?

996

Why there are some null interface in java? What does it mean?

1123

Objects or references which of them gets garbage collected?

968

What is the difference between yielding and sleeping?

1112

Difference between final and effectively final ?

1107

What does string [] args mean?

1014

what happens when a thread cannot acquire a lock on an object? : Java thread

1049

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

1029

How large is a boolean?

1014

What design pattern you have used in your project? I answered Factory pattern, how it is implemented? What are its advantage? Do know about Abstract Factory?

2505

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