class Monster extends Entity {
  public void move(int x, int y){
    this.location.setX(this.location.getX() + x);
    this.location.setY(this.location.getY() + y);
  }
}
class Room {
  public int width, height;
  public Monster[] monsters;
  public void setMonsters(Monster[] monsters){ 
    this.monsters = monsters; 
  }
}