public class ShapeTest {
     // 多态方法：接收Shape类型参数，调用对应子类的draw
     public static void drawShape(Shape s) {
         s.draw();
     }
     public static void main(String[] args) {
         // 1. 创建不同子类对象
         Shape circle = new Circle();
         Shape rectangle = new Rectangle();
         Shape shape = new Shape();
         // 2. 调用多态方法测试
         System.out.println("=== 基础题多态测试 ===");
         drawShape(shape);      // 调用父类Shape的draw
         drawShape(circle);     // 调用Circle的draw
         drawShape(rectangle);  // 调用Rectangle的draw
     }
 }