// 图形父类
class Shape {
    public void draw() {
        System.out.println("绘制图形");
    }
}

// 圆形子类
class Circle extends Shape {
    @Override
    public void draw() {
        System.out.println("绘制圆形");
    }
}

// 矩形子类
class Rectangle extends Shape {
    @Override
    public void draw() {
        System.out.println("绘制矩形");
    }
}

// 测试主类
public class ShapeTest {

    // 题目要求的方法
    public static void drawShape(Shape s) {
        s.draw();
    }

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

        drawShape(c);
        drawShape(r);
    }
}