Core Java Interview Questions
Questions Answers Views Company eMail

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

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

32 53838

Differentiate Vector and ArrayList?

Wipro, Max Telecom,

6 6752

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

Wipro,

6 7303




What is an abstract class?

Wipro,

7 6166

How can final class be used?

Wipro, Accenture,

5 8037

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

Wipro,

1 9333

Java support what type of parameter passing ?

Wipro,

7 10668

Explain the term serialization?

Wipro,

10 8510




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

Wipro, Infosys,

10 9797

What is Overriding and how can it be used?

Consagous, Wipro,

7 12501

Explain pass by reference and pass by value?

IBM, Wipro,

8 10543

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 6741

What happens when a main method is declared as private?

L&T, DELL, Infosys, Sun Microsystems,

21 32004

Is there any need to import java.lang package?

Sun Microsystems,

13 13739

What is UNICODE?

3 3846


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Un-Answered Questions { Core Java }

how to know the total memory occupied by the objects in the ArrayList(Array list may contain duplicate objects)

685


Why wait(),notify(),notifyAll() methods defined in Object class althought we are using in only threads.

1334


What are invisible components?.

875


difference between byte stream class and character stream class?

2900


How will you serialize a singleton class without violating singleton pattern?

704


make a method which any number and any type of argument and print sum of that arguments.....

535


Explain all java features with real time examples

408


What is the difference between JDBC 1.0 and JDBC 2.0?

1715


java program with complete 4 oops concepts implemented example

1890


Why are the destructors for base class and derived class called in reverse order when the program exits

882


please send me hr interview questions in it industry

708


what are Hostile Applets?

699


How to provide security in java

923


FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

1453


who can i handle multiple client in RMI

609