public class ComparaPrimaY implements Comparatore {
	@Override
	public int confronta(Punto a, Punto b) {
		if (a.y < b.y) return -1;
		if (a.y > b.y) return +1;
		if (a.x < b.x) return -1;
		if (a.x > b.x) return +1;
		return 0;
	}
	

}