Is there a way to get Eclipse to save the state of the project explorer tree and expand to where it was on startup? Every time I shut down Eclipse and start it back up, the file I had open last is opened, but the tree in the project explorer is completely collapsed...
Found it! If you click the "Link with Editor" (the button that has a left arrow over a right arrow) button in the Project Explorer, it expands the tree in the project explorer to the file you're currently editing. This is a toggle button and its state is saved when closing Eclipse. So when you open it back up, your project explorer is expanded to the file that is currently open.
来源：https://stackoverflow.com/questions/1651791/eclipse-project-explorer-expand-on-startup