title: How to access to a class which doesn't in any package
body: <p>I'm using IDEA to program java. And in my project src folder, I have two package "model" and "scene", and a Main.java to start my project. But now I find my classes in package cannot access to the Main, and I don't know why. My Main class is public I'm sure. </p>
  
  <p>And now the only way I can find is create a new package "start" to store the Main.java, and import start package when I need Main.java. Well, I find this solution is really bad. Any advice? Thanks! :)</p>