In any open source project it is important that all contributors use the same coding style. Otherwise the code ends up being a big mess.

Therefor we agreed on a few simple rules:

Naming

Variables and functions

camelCase
With the exception of global constants(static final):
UPPERCASE_WITH_UNDERSCORE

packages

lowercase_with_underscore

Class names

CapitalCamelCase

Others

Tabs for Indentation, Spaces for alignment.