Design Patterns skin mode

Facade pattern

• Provide access to the outside world for a complex of a module or subsystem interface
• Subsystems are relatively independent, external access to the subsystem can operate as long as the black box
• By providing a consistent interface to multiple complex subsystems, subsystems which the pattern to be accessed more easily

Appearance (Facade) role : to provide a common multiple of external interface subsystem. 
Subsystem (Sub System) role : to achieve part of the system functions, customers can access it through the appearance of the characters. 
Customer (Client) Role : access by various subsystems of the appearance of a role.

 1 public class Facade {
 2     public static void main(String[] args) {
 3         new total().methods();
 4     }
 5 }
 6 
 7 //外观角色
 8 class total {
 9     private one one = new one();
10     private two two = new two();
11     private three three = new three();
12 
13     public void methods() {
14         one.method1();
15         two.method2();
16         three.method3();
17     }
18 }
19 
20 //子系统
21 class two {
22     public void method2() {
23         System.out.println("方法1");
24     }
25 }
26 
27 class three {
28     public void method3() {
29         System.out.println("方法2");
30     }
31 }
32 
33 class one {
34     public void method1() {
35         System.out.println("方法3");
36     }
37 }