diff --git a/W5/Shape类.txt b/W5/Shape类.txt
new file mode 100644
index 0000000..c08e0a8
--- /dev/null
+++ b/W5/Shape类.txt
@@ -0,0 +1,22 @@
+/*定义一个抽象类draw*/
+abstract class draw{
+    public abstract void draw();
+}
+class circle extends draw{
+    public void draw(){
+        System.out.println("画一个圆形");
+    }
+}
+class retangle extends draw{
+    public void draw(){
+        System.out.println("画一个矩形");
+    }
+}
+class Main{
+    public static void main (String args[]){
+        draw d1=new circle();
+        draw d2=new retangle();
+        d1.draw();
+        d2.draw();
+    }
+}
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diff --git a/W5/Shape类运行截图.png b/W5/Shape类运行截图.png
new file mode 100644
index 0000000..1b8a64e
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diff --git a/W5/Vehiclel类运行截图.png b/W5/Vehiclel类运行截图.png
new file mode 100644
index 0000000..2781be5
Binary files /dev/null and b/W5/Vehiclel类运行截图.png differ
diff --git a/W5/Vehicle类.txt b/W5/Vehicle类.txt
new file mode 100644
index 0000000..cdb570c
--- /dev/null
+++ b/W5/Vehicle类.txt
@@ -0,0 +1,35 @@
+class Vehicle {
+    public void run() {
+
+    }
+}
+class Car extends Vehicle{
+    @Override
+    public void run(){
+        System.out.println("汽车启动了~");
+    }
+}
+class Bicycle extends Vehicle{
+    @Override
+    public void run(){
+        System.out.println("自行车启动了~");
+    }
+}
+class Truck extends Vehicle{
+    @Override
+    public void run(){
+        System.out.println("卡车启动了~");
+    }
+}
+public class Main {
+    static void main(String[] args) {
+        Vehicle[] vehicles = new Vehicle[3];
+        vehicles[0] = new Car();
+        vehicles[1] = new Bicycle();
+        vehicles[2] = new Truck();
+        for (int i = 0; i < 3; i++) {
+            Vehicle v = vehicles[i];
+            v.run();
+        }
+    }
+}
diff --git a/W5/代码介绍与Al协助说明.txt b/W5/代码介绍与Al协助说明.txt
new file mode 100644
index 0000000..8ad0d99
--- /dev/null
+++ b/W5/代码介绍与Al协助说明.txt
@@ -0,0 +1,21 @@
+Shape类：定义一个Shape类（draw（）方法），子类Circle、Rectangle重写draw（）。编写一个方法，调用其draw（）方法，并在main中测试。
+
+Vehicle类：定义一个抽象父类vehicle，包含抽象方法run（）。实现Car、Bicycle、Truck三个子类。在主方中创建Vehicle数组，存放不同车辆，遍历调用run（）。
+
+Al协助说明：
+1.怎么在main方法中创建数组？
+A:1. 创建父类类型数组，长度为3
+Vehicle[] vehicles = new Vehicle[3];
+// 2. 放入 3 个具体交通工具对象（多态）
+vehicles[0] = new Car();
+vehicles[1] = new Bicycle();
+vehicles[2] = new Truck();
+2.如何遍历数组？
+写法 1：普通 for 循环
+for (int i = 0; i < vehicles.length; i++) {
+    vehicles[i].run(); // 自动调用子类重写的run()
+}
+写法 2：增强 for 循环
+for (Vehicle v : vehicles) {
+    v.run(); // 直接遍历每个元素，无需下标
+}
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