// 父类 Shape
public class Shape {
    public void draw() {
        System.out.println("绘制一个图形");
    }
}

// 子类 Circle
public class Circle extends Shape {
    @Override
    public void draw() {
        System.out.println("绘制一个圆形 ○");
    }
}

// 子类 Rectangle
public class Rectangle extends Shape {
    @Override
    public void draw() {
        System.out.println("绘制一个矩形 ▭");
    }
}

// 测试主类
public class ShapeTest {
    // 题目要求：drawShape 方法，接收 Shape 类型参数
    public static void drawShape(Shape s) {
        s.draw(); // 多态调用
    }

    public static void main(String[] args) {
        Shape circle = new Circle();
        Shape rect = new Rectangle();

        System.out.println("=== 基础题测试 ===");
        drawShape(circle);
        drawShape(rect);
    }
}