class Rectangle {
    Rectangle(int w, int h) {
	this.width = w;
	this.height = h;
    }
    
    // Yields a rectangle with aspect ratio 2:1
    Rectangle(int h) {
	//	height = h;
	//	width = 2*h;

	this(2*h, h);
    }
    
    public String toString() {
	String str1 = "I am a rectangle of width "
	    + width + " and height " + height +
	    ". My area is " + Area();
	
	return str1;
    }
    
    private int Area() {
	return (width*height);
    }

    public int getWidth() {
	//	int foo;
	//	foo=foo+1; // not initialized

	return width;
    }

    private int width;
    private int height;
    //    public static final double pi = 3.14;
}

class Square extends Rectangle {
    Square(int side) {
	//	width = side;
	//	height = side;
	super(side,side);
    }

    public String toString() {
	return "I am a square!!!" + super.toString();
    }
}


public class OOPDemo {
    public static void main(String args[]) {
	Rectangle rec1 = new Rectangle(new Integer(10),4);
	Rectangle rec2 = new Rectangle(5,6);
	Rectangle rec3 = new Rectangle(8);

	System.out.println(rec1);
	System.out.println(rec2);
	//	rec1.Area();
	System.out.println(rec1.getWidth());

	System.out.println(rec3);
	
	Square sqr1 = new Square(15);

	System.out.println(sqr1);
    }
}