public void hit() {
		hp--;
		switch(hp) {
		case 0: this.color = Color.black; break;
		case 1: this.color = Color.yellow; break;
		case 2: this.color = Color.orange; break;
		case 3: this.color = Color.blue; break;
		case 4: this.color = Color.red; break;
		}
	}