Checks if a port is being used or not.

check port

    public boolean checkPortAvailablity(int port) {
        ServerSocket socket = null;
        try {
            socket = new ServerSocket(port);
            return true; // The port is available
        } catch (IOException e) {
            return false; //The port is being used.
        } finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }