getLocationBetween()

    public Location getLocationBetween(Location min, Location max) {
        int mid_x = (max.getBlockX() + max.getBlockX()) / 2;
        int mid_y = (max.getBlockY() + max.getBlockY()) / 2;
        int mid_z = (max.getBlockZ() + max.getBlockZ()) / 2;

        Location inbetween = new Location(min.getWorld(), mid_x, mid_y, mid_z);
        return inbetween;
    }