w5实验

w5/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/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/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/ShapeTest.java

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+public class ShapeTest{
+    // 统一绘制方法
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        Shape circle = new Circle();
+        Shape rectangle = new Rectangle();
+
+        drawShape(circle);    // 输出：绘制一个圆形 🟡
+        drawShape(rectangle); // 输出：绘制一个矩形 🟦
+    }
+}

w5/USB.java

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

w5/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);
+    }
+}

w5/shape.java

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+abstract class Shape {
+    public abstract void draw();
+}
+
+// 2. 圆形类
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制一个圆形 🟡");
+    }
+}
+
+// 3. 矩形类
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制一个矩形 🟦");
+    }
+}