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 garbage collection in Java, and how can it be used ?

Accenture, HCL, Infosys, Sara, SITS, TCS, Wipro,

32 96799

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 28907

Differentiate constructor and a method and how are it be used?

Wipro,

7 29552

What is an abstract class?

DBS, Wipro,

8 27963

How can final class be used?

Accenture, Wipro,

5 27654

By what default value is an object reference declared as an instance variable?

Wipro,

1 26659

Java support what type of parameter passing ?

Wipro,

7 20430

Explain the term serialization?

Wipro,

10 31737

Is there is any error if you have multiple main methods in the same class?

Infosys, Wipro,

10 33857

What is Overriding and how can it be used?

Consagous, Wipro,

7 33517

Explain pass by reference and pass by value?

IBM, Wipro,

8 32761

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 25684

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 75123

Is there any need to import java.lang package?

Sun Microsystems,

13 25944

What is UNICODE?

3 8732

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Un-Answered Questions { Core Java }

When will you define a method as static in Java?

1099

Are there structures in java?

1026

What are the differences between string and stringbuffer?

1175

What is the biggest integer?

1103

What is an arraylist in java?

1152

Can you write a java class that could be used both as an applet as well as an application?

999

What is string in java with example?

1107

Define how destructors are defined in java?

1069

What is thread life cycle?

1024

What is the primary benefit of encapsulation?

1151

Can a class extend 2 classes in java?

1089

Why stringbuilder is not thread safe?

1080

What is sleep method?

1220

Is simpledateformat safe to use in the multithreaded program?

1047

Is it possible to compare various strings with the help of == operator? What are the risks involved?

1123

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