1 public class Facade { 2  3     public static void main(String[] args) { 4         Facade1 f = new Facade1(); 5         f.ab(); 6         f.cd(); 7     } 8 } 9 //外观类10 class Facade1 {11 12     private A a;13     private B b;14     private C c;15     private D d;16     public Facade1() {17         a = new A();18         b = new B();19         c = new C();20         d = new D();21     }22     public void ab(){23         System.out.println("执行第一组方法");24         a.startA();25         b.startB();26     }27     public void cd() {28         System.out.println("执行第二组方法");29         c.startC();30         d.startD();31     }32 33 }34 class A{35     public void startA() {36         System.out.println("A");37     }38 }39 class B{40     public void startB() {41         System.out.println("B");42     }    43 }44 class C{45     public void startC() {46         System.out.println("C");47     }    48 }49 class D{50     public void startD() {51         System.out.println("D");52     }    53 }

输出：

　　执行第一组方法

　　A

　　B

　　执行第二组方法

　　C

　　D