上传文件至 '高级程序设计作业'

高级程序设计作业/新建 文本文档 (2).java

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+abstract class Vehicle {
+    public abstract void run();
+}
+
+class Car extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("🚗 小汽车在公路上飞驰");
+    }
+}
+
+class Bike extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("🚲 自行车在林荫道骑行");
+    }
+}
+
+class Truck extends Vehicle {
+    @Override
+    public void run() {
+        System.out.println("🚚 大卡车在运送货物");
+    }
+}
+
+public class VehicleTest {
+    public static void main(String[] args) {
+        Vehicle[] vehicles = {
+            new Car(),
+            new Bike(),
+            new Truck()
+        };
+
+        for (Vehicle v : vehicles) {
+            v.run(); 
+        }
+    }
+}

高级程序设计作业/新建 文本文档.java

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+class Shape {
+    public void draw() {
+        System.out.println("绘制图形");
+    }
+}
+
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("🎨 绘制一个圆形");
+    }
+}
+
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("🎨 绘制一个矩形");
+    }
+}
+
+public class ShapeTest {
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+
+    public static void main(String[] args) {
+        Shape circle = new Circle();
+        drawShape(circle);
+        Shape rect = new Rectangle();
+        drawShape(rect); 
+        drawShape(new Shape());
+    }
+}