//file: InterfaceTester.java
interface PointInterface {
	public void move(int dx, int dy);
}
interface RealPointInterface extends PointInterface {
	public void move(float dx, float dy);
	public void move(double dx, double dy);
}
class Point implements PointInterface {
	int x = 0, y = 0;
	public void move(int dx, int dy) { x += dx; y += dy; }
	int getX() { return x; }
	int getY() { return y; }
	int color;
}
class RealPoint extends Point implements RealPointInterface {
	float x = 0.0f, y = 0.0f;                                    
	public void move(int dx, int dy) { move((float)dx, (float)dy); }    
	public void move(float dx, float dy) { x += dx; y += dy; }          
	public void move(double dx, double dy) { move((float)dx, (float)dy); }      
	int getX() { return (int)Math.floor(x); }                    
	int getY() { return (int)Math.floor(y); }                    
}

public class InterfaceTester {
	public static void main(String[] args) {
		RealPoint rp = new RealPoint();
		Point p = rp;
		rp.move(1.718298f, 4.14159f);
		rp.move(1.0d, -1.0d);
		p.move(1, -1);
		show(p.x, p.y);                 // (0,0)
		show(rp.x, rp.y);               // (3.718298,2.14159) 
		show(p.getX(), p.getY());       // (3,2)
		show(rp.getX(), rp.getY());     // (3,2)
	}
	static void show(int x, int y) {        // Overloading show()
		System.out.println("(" + x + ", " + y + ")");
	}
	static void show(float x, float y) {
		System.out.println("(" + x + ", " + y + ")");
	}
}