In Netbeans, to the top left of where the code is, there used to be two panels, one called 'Projects' where you could click a project name to open a tree of all the directories and files in it, and you could double click a file to edit it.
Below it is the navigation panel which shows the class names, methods, etc contained in the file you're viewing.
I accidently clicked the close button on the projects panel and can't figure out how to get it to open again, any ideas?