添加 'w5/readme vehicle.txt'

w5/readme vehicle.txt

@@ -0,0 +1,42 @@
+// 抽象父类Vehicle
+abstract class Vehicle {
+    // 抽象方法run()
+    public abstract void run();
+}
+
+// 子类Car
+class Car extends Vehicle {
+    public void run() {
+        System.out.println("Car is running");
+    }
+}
+
+// 子类Bike
+class Bike extends Vehicle {
+    public void run() {
+        System.out.println("Bike is running");
+    }
+}
+
+// 子类Truck
+class Truck extends Vehicle {
+    public void run() {
+        System.out.println("Truck is running");
+    }
+}
+
+// 测试类
+class VehicleTest {
+    public static void main(String[] args) {
+        // 创建Vehicle数组
+        Vehicle[] vehicles = new Vehicle[3];
+        vehicles[0] = new Car();
+        vehicles[1] = new Bike();
+        vehicles[2] = new Truck();
+        
+        // 遍历调用run()方法
+        for (Vehicle vehicle : vehicles) {
+            vehicle.run();
+        }
+    }
+}