I did not think there was a 'paint' method in the greeps scenario. There is a Paint class, which is the actor object that a greep creates when it spits and this class would have a Paint constructor. And, there is a 'spit' method which will have a greep spit a drop of paint (a Paint object) on the ground. Maybe you need to rephrase what you are trying to do (or be a bit more specific).

oh, i confused class and method i mean i want greeps to spit paint but i cant understand spit method. i'm totally beginner so i want some examples or scenarios that use spit method

All you need do is put something like the following in the act method of the Greep class for a greep to spit: You will probably want to put a condition on calling it, however, using an 'if' clause to regulate it.