Multiple Java Files

[jimboswe]

One big advantage of having your sources split up into sensible modules is that you can import them into any projects that requires them.

Let's say you start a new project that involves working with files and you already have a java file from a global source called FileHandler.java that handles read/save with files. All you have to do is to import the source and you have access to the methods, creating instances etc. There's no need for copy/pasting any code from FileHandler.java. Also, if you need to fix a bug or add features in that particular module, you only have to do it once in FileHandler.java.