设计模式--外观模式

类图

源码

MainFrame.java
package com.facade;

public class MainFrame {
    private Memory memory=new Memory();        //关联关系建立联系
    private Cpu cpu=new Cpu();
    private HardDisk harddisk=new HardDisk();
    private Os os=new Os();
    
    public void fun() {
        memory.display();
        cpu.display();
        harddisk.display();
        os.display();
        System.out.println("开机正常");
        
    }

}

Memory.java
package com.facade;

public class Memory {
    public void display() {
        System.out.println("1、内存正常");
    }

}

Cpu.java
package com.facade;

public class Cpu {
    public void display() {
        System.out.println("2、cpu运行正常");
    }


}

Os.java
package com.facade;

public class Os {
    public void display() {
        System.out.println("4、操作系统载入正常");
    }


}

HardDisk.java
package com.facade;

public class HardDisk {
    public void display() {
        System.out.println("3、硬盘读取正常");
    }


}

Client.java
package com.facade;

import java.util.Scanner;

public class Client {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        while (true) {

            MainFrame f = new MainFrame();
            Scanner scan = new Scanner(System.in);
            System.out.println("请输入ON进行开机：");
            String str = scan.nextLine();
            if (str.equals("ON")) {
                f.fun();
            } else {
                System.out.println("输入的信息有误！！！请重新输入");
            }
        }
    }

}

测试截图