上传至w5

w5/jichu/Shape.java

@@ -0,0 +1,24 @@
+package w5.jichu;
+
+class Shape {
+    public void draw() {
+        System.out.println("绘制图形");
+    }
+}
+
+
+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/jichu/ShapeTest.java

@@ -0,0 +1,15 @@
+package w5.jichu;
+
+public class ShapeTest {
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        Shape circle = new Circle();
+        Shape rectangle = new Rectangle();
+        
+        drawShape(circle);
+        drawShape(rectangle);
+    }
+}

w5/jinjie/Vehicle.java

@@ -0,0 +1,28 @@
+package w5.jinjie;
+
+abstract class Vehicle {
+    public abstract void run();
+}
+
+class Car extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("汽车在公路上行驶");
+    }
+}
+
+class Bike extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("自行车在非机动车道行驶");
+    }
+}
+
+class Truck extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("卡车在高速上行驶");
+    }
+}
+
+

w5/jinjie/VehicleTest.java

@@ -0,0 +1,11 @@
+package w5.jinjie;
+
+public class VehicleTest {
+    public static void main(String[] args) {
+        Vehicle[] vehicles = {new Car(), new Bike(), new Truck()};
+        
+        for (Vehicle v : vehicles) {
+            v.run();
+        }
+    }
+}