Java Lab Polymorphism

package artistdemo;
 
class Shape {
    void drow() {
        System.out.println("Drawing a Shape.");
    }
}
 
class Rectangle extends Shape {
    int width,height;
    Rectangle(int w,int h) {
        width = w;
        height = h;
    }
    void drow() {
        System.out.println("Draw a rectangle...width="+width+"height="+height);
    }
}
 
class Triangle extends Shape {
    int base,height;
    Triangle(int b,int h){
        base = b;
        height = h;
    }
     void drow() {
        System.out.println("Draw a Triangle...base="+base+"height="+height);
    }
}
 
class Artist {
    public void drawShape(Shape s){
        s.drow();
    }
 
}
 
public class ArtistDemo {
 
    public static void main(String[] args) {
        Shape a = new Shape();
        Rectangle b = new Rectangle(3,4);
        Triangle c = new Triangle(6,7);
        Artist x = new Artist();
        x.drawShape(a);
        x.drawShape(b);
        x.drawShape(c);
    }
}