外观模式

什么是外观模式?

例如:打开电脑时,在电脑的内部需要执行一下几步，即启动电源、主板、硬盘，最后启动操作系统:关闭电脑时需要执行

的步骤与之正好相反。

关键：1.意图    2.动机     3.适用性

 

package org.java.test;
/**
 * @author Lee
 * 功能:定义电源类 Power，并实现启动电源和关闭电源的方法
 * @date:2018.11.27  22.23
 * 
 * */
public class Power {
	public void Connect(){
		System.out.println("Power Connect");
	}
	public void Disconnect(){
		System.out.println("Power Disconnect");
	}
}

package org.java.test;
/**
 * @author Lee
 * 功能: MainBoard  主板类 ，定义主板开关的方法
 * @date:2018.11.27 22.35
 * 
 * */
public class MainBoard {
	public void On(){
		System.out.println("MainBoard On");
		
	}
	public void Off(){
		System.out.println("MainBoard Off");
	}
}

package org.java.test;
/**
 * @author Lee
 * 功能:HardDisk 硬盘 
 * @date:2018.11.27   22.38
 * 
 * */
public class HardDisk {
		public void Run(){
			System.out.println("HardDisk Run");
		}
		public void Stop(){
			System.out.println("HardDisk Stop");
		}
}

package org.java.test;
/**
 * @author Lee
 * 功能:  OperateionSystem  操作系统
 * @date:2018.11.27  22:47
 * 
 * */
public class OperateionSystem {
	public void Startup(){
		System.out.println("OperateionSystem Startup");
	}
	public void Shutdown(){
		System.out.println("OperateionSystem Shutdown");
	}
	
}

package org.java.test;
/**
 * @author Lee
 * @param:power 电源  
 * 		  mainBoard 主板 
 *        hardDisk 硬盘    
 *        operateionSystem  操作系统
 * @date:2018.11.27 22:51
 * 
 * 
 * */
public class Computer {
	Power power;
	MainBoard  mainBoard;
	HardDisk   hardDisk;
	OperateionSystem  operateionSystem;
	public Computer(Power power, MainBoard mainBoard, HardDisk hardDisk, OperateionSystem operateionSystem) {
		super();
		this.power = power;
		this.mainBoard = mainBoard;
		this.hardDisk = hardDisk;
		this.operateionSystem = operateionSystem;
	}
	//启动计算机
	public void StartUp(){  
		this.power.Connect();
		this.hardDisk.Run();
		this.operateionSystem.Startup();
	}
	//关闭计算机
	public void Shutdown(){
		this.hardDisk.Stop();
		this.mainBoard.Off();
		this.power.Disconnect();
	}
}

package org.java.test;
/**
 * @author Lee
 * 功能：测试
 * @date:2018.11.27 23.08
 * 
 * */
public class Program {

	public static void main(String[] args) {
		Power power=new Power();  //创建电源对象
		MainBoard mainBoard=new MainBoard(); //创建主板对象
		HardDisk  hardDisk=new HardDisk(); //创建硬盘对象
		OperateionSystem  operateionSystem=new OperateionSystem(); //创建操作系统对象
		Computer  computer=new Computer(power, mainBoard, hardDisk, operateionSystem);//创建计算机对象
		System.out.println("打开电脑");
		computer.StartUp();
		System.out.println("关闭电脑");
		computer.Shutdown();
		
		
	}

}