上传文件至 'w5'

w5/Shape.java

@@ -0,0 +1,17 @@
+abstract class Shape {
+    public abstract void draw();
+}
+
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制圆形");
+    }
+}
+
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制矩形");
+    }
+}

w5/Test.java

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+public class Test {
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        // 创建不同的形状对象
+        Shape circle = new Circle();
+        Shape rectangle = new Rectangle();
+
+        // 测试drawShape方法
+        System.out.println("测试绘制圆形：");
+        drawShape(circle);
+
+        System.out.println("测试绘制矩形：");
+        drawShape(rectangle);
+    }
+}

w5/VehicleTest.java

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+abstract class Vehicle {
+    public abstract void run();
+}
+
+class Car extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("Car");
+    }
+}
+
+class Bike extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("Bike");
+    }
+}
+
+class Truck extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("Truck");
+    }
+}
+
+public class VehicleTest {
+    public static void main(String[] args) {
+        Vehicle[] vehicles = new Vehicle[3];
+        vehicles[0] = new Car();
+        vehicles[1] = new Bike();
+        vehicles[2] = new Truck();
+        for (Vehicle v : vehicles) {
+            v.run();
+        }
+    }
+}