Tet collision

Iterator<Enemy> i = rx.iterator();
while (i.hasNext()) {
    Enemy sp = i.next();
    if ((Math.abs(sp.x - p.x) <= ((sp.width + p.width) / 2f))
            && (Math.abs(sp.y - p.y) <= ((sp.height + p.height) / 2f))) {
        i.remove();
    }
}

// p - player
// sp - enemy