J260713/授课代码/c260724/src/course/polymorphism/NoteBook.java

package course.polymorphism;

/**
 * @author WanJl
 * @version 1.0
 * @title NoteBook
 * @description
 * @create 2026/7/24
 */
public class NoteBook {

    public void useUsb(Usb usb){
        usb.startUsb();
        System.out.println("开始工作.....");
        usb.stopUsb();
    }
}