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 94851

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 28395

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

Wipro,

7 29061

What is an abstract class?

DBS, Wipro,

8 27498

How can final class be used?

Accenture, Wipro,

5 27271

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

Wipro,

1 26406

Java support what type of parameter passing ?

Wipro,

7 19923

Explain the term serialization?

Wipro,

10 31005

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

Infosys, Wipro,

10 33162

What is Overriding and how can it be used?

Consagous, Wipro,

7 32980

Explain pass by reference and pass by value?

IBM, Wipro,

8 32184

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 25256

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 73602

Is there any need to import java.lang package?

Sun Microsystems,

13 25149

What is UNICODE?

3 8442

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Un-Answered Questions { Core Java }

What is parsing in grammar?

982

When to use runnable interface vs thread class in java?

936

Is char * a string?

944

What are the legal operands of the instanceof operator?

975

How do you sort a string in java?

912

What is class forname?

955

Write a program to solve producer consumer problem in java?

962

What is a method in coding?

998

What is meant by 'Class access modifiers'?

992

Can we create object of inner class in java?

890

Differentiate between class and structure.

1071

Explain java coding standards for constants?

962

Is arraylist an object in java?

1068

What is derived datatype?

1158

Can we override constructors?

949

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