public interface USB {
    void turnOn();
    void turnOff();
}

//接口的實(shí)現(xiàn)類之鼠標(biāo)
public class Mouse implements USB {
    public void turnOn(){
        System.out.println("鼠標(biāo)啟動(dòng)了");
    }
    public void turnOff(){
        System.out.println("鼠標(biāo)關(guān)閉了");
    }
}
//接口的實(shí)現(xiàn)類之鍵盤
public class KeyBoard implements USB{
    public void turnOn(){
        System.out.println("鍵盤啟動(dòng)了");
    }
    public void turnOff(){
        System.out.println("鍵盤關(guān)閉了");
    }
}
//接口的實(shí)現(xiàn)類之麥克風(fēng)
public class Microphone implements USB{
    public void turnOn(){
        System.out.println("麥克風(fēng)啟動(dòng)了");
    }
    public void turnOff(){
        System.out.println("麥克風(fēng)關(guān)閉了");
    }
}

//計(jì)算機(jī)類
public class Computer {
    private USB[] usbArr = new USB[4];
    public void add(USB usb){
        for(int i = 0; i < usbArr.length;i++)
        {
            if(usbArr[i] == null)
            {
                usbArr[i] = usb;
                break;
            }
        }
    }
    public void powerOn() {
		for(int i=0;i<usbArr.length;i++) 
        {
			if(usbArr[i]!=null) 
            {
				usbArr[i].turnOn();
			}
		}
		System.out.println("電腦開機(jī)成功");
	}
	public void powerOff()
    {
		for(int i=0;i<usbArr.length;i++)
        {
			if(usbArr[i]!=null)
            {
				usbArr[i].turnOff();
			}
		}
		System.out.println("電腦關(guān)機(jī)成功");
	}
}

public class USBTest {
    public static void main(String[] args){
        Computer p = new Computer();
        p.add(new Mouse());
        p.add(new KeyBoard());
        p.add(new Microphone());
        p.powerOn();
        System.out.println("-----------------");
        p.powerOff();
    }
}

//使用一個(gè)接口實(shí)現(xiàn)一個(gè)標(biāo)準(zhǔn),正常的開發(fā)中先寫標(biāo)準(zhǔn)（接口），再寫類
interface USB{
    public void insert();//插入
    public void setup();//安裝驅(qū)動(dòng)
}
//必須按著接口的標(biāo)準(zhǔn)使用電腦
class Computer{
    public void plugIn(USB usb){
        usb.insert();
        usb.setup();
    }
}
//鼠標(biāo)
class  Mouse implements USB{
    public void insert(){
        System.out.println("鼠標(biāo)插入");
    }
    public void setup(){
        System.out.println("鼠標(biāo)安裝驅(qū)動(dòng)");
    }
}
//U盤
class UDisk implements USB{
    public void insert(){
        System.out.println("U盤插入");
    }
    public void setup(){
        System.out.println("U盤安裝驅(qū)動(dòng)");
    }
}
class InterfaceDemo{
    public static void main(String[] args) {
        Computer computer = new Computer();//實(shí)例化電腦的對(duì)象，調(diào)用其中的方法
        computer.plugIn(new Mouse());
        System.out.println("================");
        computer.plugIn(new UDisk());
    }
}