Beginner question: errors appeared overnight
I have a frustrating problem that probably has a simple, but unintuitive solution.
I'm working in Eclipse, and I made a project and package to put all my newbie "learn the basics" java programs. Shut the computer down, went to sleep, got up, and now my project, package, basically everything except the java files themselves have x's, indicating errors. I have no idea what they are, or what happened. I changed nothing, but now I can't run any of my programs in this project in cmd, and I get complaints when I attempt to run any of them in Eclipse itself, although they still run properly if I ignore the errors, which are apparently outside the scope of these tiny little programs.
Any help is appreciated, thanks.