Specifically, IntelliJ IDEA. Download the (free) Community Edition of it here. Some people use other tools, like VS Code, but I would personally not recommend them for Java development.
Do not submit something without at least running to see if it compiles.
If you are interested in adding changing large amounts of code, first contact me via Telegram.
This means:
- Short method/variable names (multipleLongWords should be avoided if it's possible to do so reasonably, especially for variables)
Android and RoboVM (iOS) do not support many of Java 8's features, such as the packages java.util.function, java.util.stream or forEach in collections. Do not use these in your code.
If you need to use functional interfaces, use the ones in arc.func, which are more or less the same with different naming schemes.
The same applies to any class outside of the standard java.[n]io / java.net / java.util packages: Most of them are not supported.
java.awt is one of these packages: do not use it, ever. It is not supported on any platform, even desktop - the entire package is removed during JRE minimization.
In general, if you are using IntelliJ, you should be warned about platform incompatiblities.
Unless a block of code is very large or used in more than 1-2 places, don't split it up into a separate method. Making unnecessary methods only creates confusion, and may slightly decrease performance.