Java - What is singleton class & it's implementation.

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What is singleton class & it's implementation.

Total Answers and Comments: 5

Last Update: September 27, 2006

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Submitted by: Vinoth Senthill

With the Singleton design pattern you can:
Ensure that only one instance of a class is created
Provide a global point of access to the object
Allow multiple instances in the future without affecting a singleton class's clients

//Sample Code
public class SingleInstance {
private static SingleInstance ourInstance = new SingleInstance();

public static SingleInstance getInstance() {
if(null==ourInstance){
ourInstance= new SingleInstance();
}
return ourInstance;
}
private SingleInstance() {
}
}

Above answer was rated as good by the following members:
shilpad

July 01, 2005 05:20:33

Vinoth Senthill

RE: What is singleton class & it's implementation.

With the Singleton design pattern you can:
Ensure that only one instance of a class is created
Provide a global point of access to the object
Allow multiple instances in the future without affecting a singleton class's clients

//Sample Code
public class SingleInstance {
private static SingleInstance ourInstance = new SingleInstance();

public static SingleInstance getInstance() {
if(null==ourInstance){
ourInstance= new SingleInstance();
}
return ourInstance;
}
private SingleInstance() {
}
}

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1 0

Overall Rating: +1

September 08, 2005 00:40:41

Rose

RE: What is singleton class & it's implementation.

Nice explanation.... usage of singleton classes can also be included..

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October 18, 2005 06:59:33

Hemanth Kumar Venugobal

RE: What is singleton class & it's implementation...

good

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September 12, 2006 07:47:52

artika

then why class

when only one instance of a class can be made

then wat's the purpose of makin it as a class

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September 27, 2006 04:35:32

chandrakanth

RE: What is singleton class & it's implementation...

In singleton class ,only one time the instance wil create.Example....

public class Sin
{
static Sin s=null;
public static void main(String a[])
{
     create();
     create();
     create();
}
public static Sin create()
{
      if(s==null)
      {
         s=new Sin();
      }
      else
      {
       System.out.println("Please it is a single ton class");
      }
   return s;
}
private Sin()
{
      System.out.println("Single ton class");
}
}

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