/**
 * Title: ShapeIntergace
 * Description: Interface inheritence with Shape interface
 * @author hollingd@cs.rpi.edu
 */


// declare the interface
interface Shape {
	
	// every shape needs a draw methods
	void Draw();

	// every shape needs a print method
	void Print();
}


class Square implements Shape {
	Point lowerleft;
	int sidelen;

	// default constructor
	Square() {
		this(0,0,0);
	}

	Square(int x, int y, int size) {
		lowerleft = new Point(x,y);
		sidelen = size;
	}

	public void Draw() {
		System.out.println("Drawing a Square of size " + sidelen + " from " + lowerleft);
	}

	public void Print() {
		System.out.println("Square(" + lowerleft + "," + sidelen+")");
	}
}


class Circle implements Shape {
	Point center;
	int radius;

	// default constructor
	Circle() {
		this(0,0,0);
	}

	Circle(int x, int y, int size) {
		center = new Point(x,y);
		radius = size;
	}

	public void Draw() {
		System.out.println("Drawing a Circle of radius " + radius  + " at " + center);
	}

	public void Print() {
		System.out.println("Circle(" + center + "," + radius+")");
	}
}


class Point {
	int x,y;
	// constructor - notice we can use this to get past
	//   the (silly) field name shadowing.
	Point( int x, int y) {
		this.x = x;
		this.y = y;
	}

	// a method that allows moving the point
	void MoveTo(int newx, int newy) {
		x = newx; y = newy;
	}

	// this is called by System.out.println
	//  (or anything that treats it as a String)
	public String toString() {
		return(x + "," + y );
	}
}




// this class is for testing 
public class ShapeInterface {

	public static void main(String[] args) {
		// create some point and circle objects
		// we can create and array of Shape objects and put them there

		Shape [] s = new Shape[6];

		int i;

		for (i=0;i<3;i++)
			s[i]= new Circle(i,i,i);

		for (;i<6;i++)
			s[i]= new Square(2*i,i,3*i);

		// print out the list of shapes

		for (i=0;i<6;i++)
			s[i].Print();
	}

}