When connecting Processing to an Arduino (or whatever serial port)... this can come in handy in case the ports get scrambled! Arrg!

processing-given-serialport

  int port = 0;

  for (int i=0; i<Serial.list().length; i++) {
    println(Serial.list()[i]);
    if (Serial.list()[i].equals("/dev/tty.usbserial-A900F5IY")) {
      println("ding!");
      port = i;
    }
  }

  arduino = new Serial(this, Serial.list()[port], 9600);