Java usb接口的实现

package test3;

import test3.Usb;
import test3.Usb.Computer;
import test3.Usb.KeyBoard;
import test3.Usb.klj;
import test3.Usb.Mouse;
import test3.Usb.upan;
import test3.Usb.ydyp;

public interface Usb{
	void turnOn();
	void turnOff();


public class Mouse implements Usb {

	@Override
	public void turnOn() {
		// TODO Auto-generated method stub
		System.out.println("鼠标启动了");
	}

	@Override
	public void turnOff() {
		// TODO Auto-generated method stub
		System.out.println("鼠标关闭了");
	}
}

	public class KeyBoard implements Usb{

		@Override
		public void turnOn() {
			// TODO Auto-generated method stub
			System.out.println("键盘启动了");
		}

		@Override
		public void turnOff() {
			// TODO Auto-generated method stub
			System.out.println("键盘关闭了");
		}
		
	}
	public class klj implements Usb{

		@Override
		public void turnOn() {
			// TODO Auto-generated method stub
			System.out.println("刻录机启动了");
		}

		@Override
		public void turnOff() {
			// TODO Auto-generated method stub
			System.out.println("刻录机关闭了");
		}
		
	}
	public class upan implements Usb{

		@Override
		public void turnOn() {
			// TODO Auto-generated method stub
			System.out.println("u盘启动了");
		}

		@Override
		public void turnOff() {
			// TODO Auto-generated method stub
			System.out.println("u盘关闭了");
		}
		
	}
	public class ydyp implements Usb{

		@Override
		public void turnOn() {
			// TODO Auto-generated method stub
			System.out.println("移动硬盘启动了");
		}

		@Override
		public void turnOff() {
			// TODO Auto-generated method stub
			System.out.println("移动硬盘关闭了");
		}
		
	}
	public class Computer {
		private Usb[] usbArr = new Usb[6];
		
		public void add(Usb usb) {
			for(int i=0;i