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 50209

Differentiate Vector and ArrayList?

Wipro, Max Telecom,

6 5523

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


6 6021

What is an abstract class?


7 4990

How can final class be used?

Wipro, Accenture,

4 6867

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


1 8043

Java support what type of parameter passing ?


7 9334

Explain the term serialization?


10 7423

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


10 8654

What is Overriding and how can it be used?

Consagous, Wipro,

7 11584

Explain pass by reference and pass by value?

IBM, Wipro,

8 9424

In which way does a Primitive data type is passed ?

Sun Microsystems,

5 5870

What happens when a main method is declared as private?

L&T, DELL, Infosys, Sun Microsystems,

20 26764

Is there any need to import java.lang package?

Sun Microsystems,

13 12262

What is UNICODE?

3 3241

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Un-Answered Questions { Core Java }

23. Storage space in java is of the form Stack Queue Heap List 24. What is java code embedded in a web page known as Applets Servlets scriptlets snippets 25. Which of the following attributes are compulsory with an tag?. code,height & width. 26. What does 'CODEBASE' in an applet tag specify?. Files absolute path.


Howto get an object that will perform date & time calculations then format it for output in some different locales with different date style.can ne1 tel me the answer of this question.pls


What are the restrictions imposed by a Security Manager on Applets?.


which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?


What is procedure overloading?


How do you sing an Applet ?


how to deploy apache tomcat server to weblogic server in java


How to solve the problem of generating the unique hash keys with hash function?


Write an algorithm program in java for the following question.. 1) S is a set of integers.X is an integer obtained by sum of two digits in S. Write logic for whether or not the X is from the S. The time of algorithm should not exceed o(n logn).


What are invisible components?.


which is advanced deep technology in java launched by the sun microsystem??? The answer is very logical If u need correct answer mail me at


We are seeing so many videos/audios as many web sited. But question is these videos or audios are stored in Databases ( Oracle, Mysql, Sybase,... ) or stored any file directory from there they will give the link for that? Pls explain and give sample code to achieve this one? Thanks, Seenu.


how we can use debug in myeclipse 6.0 in order solve the problems that exist in our program when there are 900 to 1000 pages in a web application


difference between byte stream class and character stream class?


when to use ArrayList and when to use HashMap in webApplication.