Design mode: single-case mode

Singleton Mode (Singleton): guarantees that a class has only one instance and provides a global access point to access it.

Lazy Type:

namespacesingletondesign{ Public classSingleton {Private StaticSingleton instance; Private Static ReadOnly ObjectSyncRoot =New Object(); PrivateSingleton () {} Public StaticSingleton getinstance () {if(instance==NULL)            {                Lock(syncRoot) {if(Instance = =NULL) {instance=NewSingleton (); }                }            }            returninstance; }    }}

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Test code:

             for (int i=0;i<; i++)            {                = =                    {= singleton.getinstance ();                    Console.WriteLine (S.gethashcode ());                });            

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A Hungry man type:

 namespace   singletondesign{ public  sealed  class   Singleton { private  static  readonly  Singleton instance=        Singleton ();  private   Singleton () {}  public  static   Singleton getinstance () {         return   instance; }    }}

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Design mode: single-case mode