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 79148

Differentiate Vector and ArrayList?

Max Telecom, Wipro,

6 15262

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

Wipro,

7 15973

What is an abstract class?

DBS, Wipro,

8 14523

How can final class be used?

Accenture, Wipro,

5 14667

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

Wipro,

1 14014

Java support what type of parameter passing ?

Wipro,

7 18681

Explain the term serialization?

Wipro,

10 17524

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

Infosys, Wipro,

10 19446

What is Overriding and how can it be used?

Consagous, Wipro,

7 19921

Explain pass by reference and pass by value?

IBM, Wipro,

8 18871

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 12728

What happens when a main method is declared as private?

DELL, Infosys, L&T, Sun Microsystems,

22 58408

Is there any need to import java.lang package?

Sun Microsystems,

13 23327

What is UNICODE?

3 7573

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Un-Answered Questions { Core Java }

Can we sort set in java?

753

Can we overload destructor in java?

776

Why are global variables used?

730

Do we have pointers in java?

730

Difference between linkedlist and arraylist.

824

Can we access the non-final local variable, inside the local inner class?

788

What is use of super keyword?

759

What is use of functional interface in java 8? Explain

786

Which is bigger double or float?

741

what are synchronized methods and synchronized statements? : Java thread

790

Write a method to check if input string is palindrome?

786

What is the requirement of thread in java?

838

Why is inheritance used in java?

838

What is a programming object?

788

What is a boolean output?

733

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