New to Java

I have a JFileChooser which the user uses to pick an excel file that will be imported and displayed in a JTable. I'm looking for a way for the program to save the user's choice as the default, so that every time the application closes and is reopened, he won't have to re-pick the file (unless he is changing it). i'm already using the java.util.prefs class to save other preferences but it seems it only works for primitive data types and so i can't save a "file" to one of the nodes... is there some other way? or am i missing something in the java.util.prefs class?