Facade把子系统的功能都包含进来了,这些子系统都有一个doSomething(),来给Client1和Client2调用的.

缺点是客户端是直接调用这些功能模块的.

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//外观//最大的一个好处是我们的老百姓MainClass不用再调用子系统,因为你调用子系统的话还需要判断要调用哪些子系统,// public class Facade {     private  SystemA systemA;     private  SystemB systemB;     private  SystemC systemC;    public Facade() {        //super();        systemA = new SystemA();        systemB = new SystemB();        systemC = new SystemC();        }        //public void doSomething(){
        public void doABC(){                  this.systemA.doSomething();         this.systemB.doSomething();         this.systemC.doSomething();              }          public void doAB(){         this.systemA.doSomething();         this.systemB.doSomething();              }     }

//客户端...//缺点是客户端是直接调用这些功能模块的.//外观模式将客户端与具体的功能模块相区分,客户端所要知道的只有这个外观了.以后会接触门面模式,与外观模式是//完全不同的概念.//客户端只调用外观的方法,至于外观的方法里面怎么将功能模块组合和调用我不管.public class MainClass {  /*   public static void main(String[] args) {        //实现A子系统功能        SystemA  systemA = new SystemA();        systemA.doSomething();                SystemB systemB = new SystemB();        systemB.doSomething();                SystemC systemC  =   new SystemC();        systemC.doSomething();            } */    public static void main(String[] args) {        Facade  facade = new Facade();//这样客户端不与子系统打交道了,只与外观Facade打交道了.        //facade.doSomething();        facade.doABC();    }}

public class MainClass2 {    public static void main(String[] args) {/*        //实现A子系统功能        SystemA systemA  = new SystemA();        systemA.doSomething();                SystemB systemB = new SystemB();        systemB.doSomething();*/                Facade facade  =  new Facade();        facade.doAB();    }}

/** * A子系统 * @author zhongzh * */public class SystemA {     public void doSomething(){         System.out.println("实现A子系统功能");              }}

/** * B子系统 * @author zhongzh * */public class SystemB {     /*      * B子系统实现      *       */        public void doSomething(){        System.out.println("实现B子系统功能");    }}

/** * C子系统 * @author zhongzh * */public class SystemC {     /*      * C子系统实现功能      *       */        public void doSomething(){        System.out.println("实现C子系统功能");    }}

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package com.ibeifeng.news;public class GuoZai {    public void mai(){        System.out.println("买国债");                    }}

package com.ibeifeng.news;public class Gupiao {   public  void mai(){       System.out.println("买股票");   }}

package com.ibeifeng.news;//基金有很多种,有货币型的基金,//外观模式include创建一个引用.public class JiJin {     private  Gupiao  gupiao;     private  GuoZai  guozai;     private  Qihuo qihuo;    public JiJin() {        this.guozai = new GuoZai();        this.gupiao = new Gupiao();        this.qihuo  = new Qihuo();            }    public void maiJijinA(){        this.guozai.mai();        this.gupiao.mai();            }    public void maiJijinB(){        this.guozai.mai();        this.gupiao.mai();        this.qihuo.chao();    }     }

package com.ibeifeng.news;public class MainClass {    public static void main(String[] args) {/*        //80年代,基金出现之前        Gupiao  gupiao  = new Gupiao();        gupiao.mai();                Qihuo qihuo = new Qihuo();        qihuo.chao();                GuoZai guozhai =  new GuoZai();        guozhai.mai();*/                //有了基金之后        /*JiJin jijin =  new JiJin();        jijin.maiJijinA();*/                JiJin jijin =  new JiJin();//另外一个老百姓...        jijin.maiJijinB();            }}

package com.ibeifeng.news;public class Qihuo {       public void  chao(){                        System.out.println("买期货");        }}