Java Learning notes--design pattern four. Proxy mode

To being, or not to Be:that is the question.

--"Hamlet"

Proxy mode, which provides a proxy for other objects to control access to this object.

On the code:

1 Package Cn.no4.proxy; 2 3  Public Interface Imakemoney {45     void Makemoney (); 6 }

1 Package Cn.no4.proxy;2 3  Public classProxy implements Imakemoney {4 5     Privateboss boss;6     7      PublicProxy () {8Boss =NewBoss ();9     }Ten  One @Override A      Public voidMakemoney () { -System. out. println ("on the surface is proxy doing things ..."); - Boss.makemoney (); the     } -  -}

1 Package Cn.no4.proxy;2 3  Public classBoss implements imakemoney{4 5     Private DoubleMoney ;6     7     8      Public DoubleGetmoney () {9         returnMoney ;Ten     } One  A  -      Public voidSetmoney (DoubleMoney ) { -          This. Money =Money ; the     } -  -  - @Override +      Public voidMakemoney () { -          +Money + =5000000; ASystem. out. println ("is actually behind the big boss dry, Big Boss got $"+Money ); at     } -  -}

Test class:

 1  package cn.no4.proxy;  2  3  public  class   _test { 4  5  public  static  void   main (string[] args) { 6  proxy proxy = new   Proxy ();  7   Proxy.makemoney ();  8  }  9  }

The following changes the Makemoney method of the proxy class, which realizes the control of the Boss object access:

1 Package cn.no4.proxy.instance;2 3  Public classProxy implements Imakemoney {4 5     Privateboss boss;6     7      PublicProxy () {8Boss =NewBoss ();9     }Ten  One @Override A      Public voidMakemoney (DoubleMoney ) { -System. out. println ("on the surface is proxy doing things ..."); -         //The following code implements control of boss access the         if(Money <5000000.0) { -System. out. println ("too little money to send beggars! "); -}Else{ - Boss.makemoney (money); +         } -     } +  A}

Test class:

1 Package cn.no4.proxy.instance;2 3  Public class_test {4 5      Public Static voidMain (string[] args) {6Proxy proxy =NewProxy ();7Proxy.makemoney (1);8Proxy.makemoney (5000000);9     }Ten}

Proxy.makemoney (1); Unable to access the Boss object because 1 bucks is too little for the boss.

Proxy.makemoney (5000000);  This gives you access to the Boss object and executes the boss's Makemoney method.

Java Learning notes--design pattern four. Proxy mode