What is singleton class?

Answers were Sorted based on User's Feedback

What is singleton class?..

Answer / muthu

this is muthu,

i have created singleton class A this class file warped
(warfile) and same singleton class A that class also warped
(warfile)so both war file deployed inthe Application server
then start the server.so how many instance create in JVM?


Is This Answer Correct ?    0 Yes 0 No

What is singleton class?..

Answer / ashish srivastava

public class Singleton {

private static Singleton s = new Singleton();

private Singleton(){


public static Singleton getObject(){
return s;


Is This Answer Correct ?    0 Yes 0 No

What is singleton class?..

Answer / nagarjuna

Singletonclass is a class which can be instantiated only once.
public class Singleton
private static single = new Singleton();

Private Singleton();

For a singleton class, the constructor is made private and
a static variable is used for instatiating the class.

Is This Answer Correct ?    4 Yes 6 No

What is singleton class?..

Answer / ajay

how constructor can be private???????

Is This Answer Correct ?    0 Yes 2 No

What is singleton class?..

Answer / marshallsudhan

singleton class - has single Instance.

The Singleton is a useful Design Pattern for allowing only
one instance of your class, but common mistakes can
inadvertently allow more than one instance to be created.

The Singleton's purpose is to control object creation,
limiting the number to one but allowing the flexibility to
create more objects if the situation changes. Since there
is only one Singleton instance, any instance fields of a
Singleton will occur only once per class, just like static

//Eg Pgm.

class Sample
void m1()
System.out.println("Method m1");
void m2()
System.out.println("Method m2");
private Sample()
public static void main(String[] args)
Sample s = new Sample();

Is This Answer Correct ?    49 Yes 74 No

What is singleton class?..

Answer / ravikiran(aptech mumbai)

singleton class is the class contains only one object

Is This Answer Correct ?    39 Yes 71 No

Post New Answer

More Core Java Interview Questions

whar are the draw backs of programming lang step by step in Clang and next in C++ and next and in Java nad in .Net

0 Answers  

explain about method overloading and method overriding with difficult examples

4 Answers  

what is the difference between applet and swing and gui application in java . What we do with the collections set and list interface

2 Answers   CTS, Phoenix Technologies,

what are the application of compiler and interpreter for source program

2 Answers  

What is meant by throwing an Exception?

4 Answers   Accenture,

what is template design pattern?

0 Answers  

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

9 Answers   KPIT,

Hai friends I am MCA 2006 passout. Spend time in 1 yr for teacing and 5 months in small s/w firm. worked in 4 or 5 months in few places. Presently I am writing bank exams. I want to get back to IT sector. Are there any possibilities. any growth prospects?. I am having some knowledge in core and advanced java. I am so desperate. Any suggestions thanks in advance. u can write to my mail mahidestiny@gmail.com

4 Answers  

what is Dictionary? and what purpose it is used for?

3 Answers  

explain Anonynous inner class?

6 Answers   TCS,

What is the difference between Java Bean and Java Class.?

2 Answers  

adapter class ?

2 Answers