Use ctrl-t often to auto-format your code in processing. Also save and run often. To run often makes sure you always have a working version, so errors can not grow inside your code.

By convention, the order of a Processing sketch is usually:

• any library import statements
• any global variables
• setup
• draw
• everything else (functions and classes)

This is true of almost every example in the reference, tutorials, examples, library examples, and most sketches on this forum.

If you have a method that works for you and is consistent, you can use it -- just be aware that others may be very confused reading your code if you put global variables halfway down your code.

Use comments often.

All class Names start with a Capital like 'class Figure' or 'FigureShape'.

Variables are starting with a small letter: figure. Also, you can write a Capital inside a word if you glue words: successfulfigure is better written as successfulFigure.

Constants are all captial, for glue words with _ : STRENGTH or FIGURE_STRENGTH.

When you have a class Ball and an array or ArrayList of that, note singular and plural: Ball[] balls;

Best is to hit ctrl-t in processing first before copy paste into the forum (https://forum.processing.org).

You can edit your post (click the small gear and the 'Edit').

How to format Code:

• empty line before and after the code section

• select (highlight) entire code with the mouse

• hit ctrl-o OR click the small C in the command bar