14 Tweak the Arduino Logo: How to print the list of serial ports in Processing?

https://github.com/arduino/Arduino/blob/master/build/shared/examples/10.StarterKit/p14_TweakTheArduinoLogo/p14_TweakTheArduinoLogo.ino#L66
I do not see the list of all the serial ports on my computer. How can I fix this?