package Shape;

abstract public class Shape {
    abstract void draw();
}
class Circle extends Shape{
    private double r;
    public Circle(double r){
        this.r=r;
    }
    @Override
    public void draw(){
        System.out.println("已绘制半径为"+r+"的圆");
    }
}

class Rectangle extends Shape{
    private double chang;
    private double kuan;
    public Rectangle(double chang,double kuan){
        this.chang=chang;
        this.kuan=kuan;
    }
    @Override
    public void draw(){
        System.out.println("已绘制长宽分别为"+chang+"和"+kuan+"的矩形");
    }
}

class Triangle extends Shape{
    private double di;
    private double height;
    public Triangle(double di,double height){
        this.di=di;
        this.height=height;
    }
    @Override
    public void draw(){
        System.out.println("已绘制底和高分别为"+di+"和"+height+"的三角形");
    }
}

class ShapeUtil{
    public static void drawShape(Shape s){
        s.draw();
    }
}