/**
*
* @author: muyichun
* @date : 2016年3月23日09:34:48
* @function: 外观模式
*/
public class Main{
public static void main(String[] args) {
Computer computer = new Computer();
computer.startup();
computer.shutdown();
}
}
class CPU{
public void startup(){
System.out.println("CPU start up!");
}
public void shutdown(){
System.out.println("CPU shutdown up!");
}
}
class Memory{
public void startup(){
System.out.println("Memory start up!");
}
public void shutdown(){
System.out.println("Memory shutdown up!");
}
}
class Disk{
public void startup(){
System.out.println("Disk start up!");
}
public void shutdown(){
System.out.println("Disk start up!");
}
}
class Computer{
private CPU cpu;
private Memory memory;
private Disk disk;
public Computer(){
cpu = new CPU();
memory = new Memory();
disk = new Disk();
}
public void startup(){
System.out.println("start the computer!");
cpu.startup();
memory.startup();
disk.startup();
System.out.println("start computer finished!");
}
public void shutdown(){
System.out.println("begin to close the computer!");
cpu.shutdown();
memory.shutdown();
disk.shutdown();
System.out.println("computer closed!");
}
}
如果我们没有Computer类,那么,CPU、Memory、Disk他们之间将会相互持有实例,产生关系,这样会造成严重的依赖,修改一个类,可能会带来其他类的修改,这不是我们想要看到的,有了Computer类,他们之间的关系被放在了Computer类里,这样就起到了解耦的作用,这,就是外观模式!
——贴上自己喜欢的代码!