What is a singleton class?How do you writer it? Tell examples?


A class which must create only one object (ie. One instance) irrespective of any number of object creations based on that class.

Steps to develop single ton class:-

1.Create a Private construcor, so that outside class can not access this constructor. And declare a private static reference of same class

2.Write a public Factory method which creates an object. Assign this object to private static Reference and return the object

Sample Code:-

class SingleTon

{

private static SingleTon st=null;

private SingleTon()

{

System.out.println(“\nIn constructor”);

}

public static SingleTon stfactory()

{

if(st==null) st=new SingleTon();

return st;

}

}

 

 

For complete Example of Singleton design pattern click here