上传文件至 'w5'

w5/Circle.java

@@ -0,0 +1,8 @@
+package w5;
+
+class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("Drawing Circle");
+    }
+}

w5/Main.java

@@ -0,0 +1,19 @@
+package w5;
+
+public class Main {
+    public static void main(String[] args) {
+        // 创建图形对象
+        Circle circle = new Circle();
+        Rectangle rectangle = new Rectangle();
+
+        // 调用统一接口方法
+        System.out.println("=== 开始绘图 ===");
+        drawShape(circle);
+        drawShape(rectangle);
+    }
+
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+}
+

w5/Rectangle.java

@@ -0,0 +1,8 @@
+package w5;
+
+class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("Drawing Rectangle");
+    }
+}

w5/Shape.java

@@ -0,0 +1,5 @@
+package w5;
+
+public abstract class Shape {
+    public abstract void draw();
+}