What is singleton class & it's implementation.

Vinoth Senthill

• Jul 1st, 2005

 

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() { 
} 
} 

Rose

• Sep 8th, 2005

 

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

Hemanth Kumar Venugobal

• Oct 18th, 2005

 

good

artika

• Sep 12th, 2006

 

when only one instance of a class can be made

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

chandrakanth

• Sep 27th, 2006

 

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");
  }
}