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,

1101

What is meant by 'Class access modifiers'?

HCL,

1054

Compare Mutex and Semaphore in java.

Ciena,

1013

Describe the Big-O Notation.

Global Logic,

1061

What is the use of StringTokenizer class?

Hexaware, Virtusa,

1076

Difference between stack and queue?

Flextronics,

1092

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

Fidelity,

1101

What is the concatenation operator in java?

Aspire, Infogain,

1164

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

Global Logic,

1153

What is OOP's Terms with explanation?

1200

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

DELL,

1206

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

Genpact,

1012

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

InfoAxon Technologies,

1076

Can a private method be declared as static?

Global Logic,

1028

What do you understand by access specifiers in Java?

Genpact,

1022

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Un-Answered Questions { Core Java }

What is a jit compiler?

1149

What is a boolean field?

968

What is structure of java heap? What is perm gen space in heap?

1134

What is a data structure java?

1017

Is singleton class thread safe?

1005

What's the purpose of static methods and static variables?

1104

How does thread synchronization occurs inside a monitor? What levels of synchronization can you apply?

968

What is static method with example?

1186

How do you write methodology?

996

What is nan in java?

1003

What is currentthread()?

1009

Can you pass functions in java?

1042

What are dot operator queries?

1116

Explain about main thread in java?

1093

How can you set an applet’s height and width as a percentage?

939

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