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定义鼠标、键盘,笔记本三者之间应该遵守的规则
interface USB { void open();// 开启功能 void close();// 关闭功能 }
鼠标实现USB规则
class Mouse implements USB { public void open() { System.out.println("鼠标开启");
} public void close() { System.out.println("鼠标关闭"); } }
键盘实现USB规则
class KeyBoard implements USB { public void open() {
System.out.println("键盘开启"); } public void close() { System.out.println("键盘关闭");
} }
定义笔记本
class NoteBook { // 笔记本开启运行功能 public void run() { System.out.println("笔记本运行");
} // 笔记本使用usb设备,这时当笔记本对象调用这个功能时,必须给其传递一个符合USB规则的USB设备 public void useUSB(USB
usb) { // 判断是否有USB设备 if (usb != null) { usb.open(); usb.close(); } } public
void shutDown() { System.out.println("笔记本关闭"); } }
public class Test { public static void main(String[] args) { // 创建笔记本实体对象
NoteBook nb = new NoteBook(); // 笔记本开启 nb.run(); // 创建鼠标实体对象 Mouse m = new
Mouse(); // 笔记本使用鼠标 nb.useUSB(m); // 创建键盘实体对象 KeyBoard kb = new KeyBoard(); //
笔记本使用键盘 nb.useUSB(kb); // 笔记本关闭 nb.shutDown(); } }