diff --git a/W5/usb/Computer.java b/W5/usb/Computer.java
new file mode 100644
index 0000000..360924f
--- /dev/null
+++ b/W5/usb/Computer.java
@@ -0,0 +1,10 @@
+// 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");
+    }
+}
\ No newline at end of file
diff --git a/W5/usb/Keyboard.java b/W5/usb/Keyboard.java
new file mode 100644
index 0000000..77d63a9
--- /dev/null
+++ b/W5/usb/Keyboard.java
@@ -0,0 +1,11 @@
+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。");
+    }
+}
\ No newline at end of file
diff --git a/W5/usb/Mouse.java b/W5/usb/Mouse.java
new file mode 100644
index 0000000..7d88ce9
--- /dev/null
+++ b/W5/usb/Mouse.java
@@ -0,0 +1,11 @@
+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。");
+    }
+}
\ No newline at end of file
diff --git a/W5/usb/USB.java b/W5/usb/USB.java
new file mode 100644
index 0000000..b97ff5d
--- /dev/null
+++ b/W5/usb/USB.java
@@ -0,0 +1,4 @@
+public interface USB {
+    void open();
+    void close();
+}
\ No newline at end of file
diff --git a/W5/usb/USBTest.java b/W5/usb/USBTest.java
new file mode 100644
index 0000000..6a93436
--- /dev/null
+++ b/W5/usb/USBTest.java
@@ -0,0 +1,13 @@
+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);
+    }
+}
\ No newline at end of file
diff --git a/W5/usb测试运行.png b/W5/usb测试运行.png
new file mode 100644
index 0000000..ee21654
Binary files /dev/null and b/W5/usb测试运行.png differ