USB

W5/usb/Computer.java

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+// Computer.java
+public class Computer {
+    public void useUSB(USB usbDevice) {
+        System.out.println("电脑检测到 USB 设备插入。");
+        usbDevice.open();
+        // 模拟使用过程
+        usbDevice.close();
+        System.out.println("USB 设备已移除。\n");
+    }
+}

W5/usb/Keyboard.java

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+public class Keyboard implements USB {
+    @Override
+    public void open() {
+        System.out.println("键盘已开启，准备输入。");
+    }
+
+    @Override
+    public void close() {
+        System.out.println("键盘已关闭。");
+    }
+}

W5/usb/Mouse.java

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+public class Mouse implements USB {
+    @Override
+    public void open() {
+        System.out.println("鼠标已开启，准备移动。");
+    }
+
+    @Override
+    public void close() {
+        System.out.println("鼠标已关闭。");
+    }
+}

W5/usb/USB.java

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+public interface USB {
+    void open();
+    void close();
+}

W5/usb/USBTest.java

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+public class USBTest {
+    public static void main(String[] args) {
+        Computer computer = new Computer();
+
+        // 1. 插入鼠标
+        USB mouse = new Mouse();
+        computer.useUSB(mouse);
+
+        // 2. 插入键盘
+        USB keyboard = new Keyboard();
+        computer.useUSB(keyboard);
+    }
+}