interface Drawable{
	void draw();
}
class Rectangle implements Drawable{
	public void draw(){
		System.out.println("Drawing rectangle");
	}
}
class circle implements Drawable{
	public void draw(){
		System.out.println("Drawing circle");
	}
}	
class TestInterface{	
	public static void main(String[]args){
		Drawable d = new circle();
		d.draw();
	}
}