Took me quite a while, but here it is!
For those who doesn’t know who is that or what, that is Steve, he is a default skin for male player ( or at least that consider to be for male ) in Minecraft world. I like playing Minecraft, especially with my friends, or other people hehe.
Well put that aside, messing with Processing require a lot of concentration, Processing itself require you to write a code that is using Java, not Java entirely, but only the simple line command in Java. Not only Java, but you can use other like js ( Java Script ), and py ( Python ).
For those who struggle using Processing Language, there are bunch of tutorials in the official website, or you can simply click “here”, and you can also get the book for more information.
WARNING : you can’t simply mastering Java if you can master Processing lol