Java Singleton mode example

1. First write a singleton class

 

Package stone;
Public class Singleton {
Private Static Singleton instance;
Private Singleton (){}
Public static Singleton getinstance (){
If (instance = NULL)
Instance = new Singleton ();
Return instance;
}
}

 

2. Write another testsingleton class.

 

Package stone;
Public class testsingleton {
Public static void main (string [] ARGs ){
Singleton S1 = singleton. getinstance ();
Singleton S2 = singleton. getinstance ();
If (S1 = S2)
System. Out. println ("S1 = S2 ");
Else
System. Out. println ("S1 <> S2 ");
}
}

 

3. Run testsingleton. The result is as follows:

S1 = S2

 

4. The Singleton mode is successfully tested.