设计模式--结构型--外观模式

外观模式--也称为门面模式 


有主系统对子系统进行统一的管理  比如 电脑开关（cpu开关，memory开关，disk开关）

package com.facade;

public class Disk {

	public void start(){
		System.out.println("disk is opend");
	}
	
	public void stop(){
		System.out.println("disk is closed");
	}
}

package com.facade;

public class Cpu {
	public void start(){
		System.out.println("cpu is opend");
	}
	
	public void stop(){
		System.out.println("cpu is closed");
	}
}

package com.facade;

public class Computer {
	private Disk disk = new Disk();
	private Cpu cpu = new Cpu();
	
	public void start(){
		disk.start();
		cpu.start();
	}
	
	public void stop(){
		disk.stop();
		cpu.stop();
	}
	
}

package com.facade;

public class Test {
	public static void main(String[] args) {
		Computer computer = new Computer();
		
		computer.start();
		computer.stop();
	}
}

disk is opend
cpu is opend
disk is closed
cpu is closed