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 do you mean Abstraction in java?

Aspire, Infogain,

1052

What is meant by 'Class access modifiers'?

HCL,

997

Compare Mutex and Semaphore in java.

Ciena,

956

Describe the Big-O Notation.

Global Logic,

1007

What is the use of StringTokenizer class?

Hexaware, Virtusa,

1036

Difference between stack and queue?

Flextronics,

1035

Describe the syntax of multiple inheritance? When do we use such an inheritance?

Fidelity,

1056

What is the concatenation operator in java?

Aspire, Infogain,

1093

Explain the access modifiers for a class, method and variables?

Global Logic,

1104

What is OOP's Terms with explanation?

1143

What is better - 'bit-shift a value' or 'multiply by 2'?

DELL,

1135

How would you use Bubble Sort to sort the number of elements?

Genpact,

969

What is close method? How it's different from Finalize & Dispose?

InfoAxon Technologies,

1013

Can a private method be declared as static?

Global Logic,

979

What do you understand by access specifiers in Java?

Genpact,

977

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Un-Answered Questions { Core Java }

What is jit compiler in java?

1056

Explain the difference between treeset and treemap in java?

937

Which list is sorted in java?

982

What is the purpose of the runtime class in java programming?

1025

Is empty list java?

885

What is the same as procedures?

940

What does compareto () do in java?

962

Explain the difference between an Interface and an Abstract class?

1133

What is jpa specification?

932

Explain working of call by reference function invoking.

975

What is a boolean used for?

1075

What does file separator do in java?

986

How does sublist works in java?

920

Write a program to print fibonacci series up to count 10.

862

What methods are used in Servlet?Applet communication?

2194

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