Sarah, I managed to generate the class diagram for a simple program ( 4 files only) with inheritance relationship. Here is a brief
instruction given by ArgoUML.
* File->Import Sources
* Change the Files of Types to "All Files"
* Select the directory (where the *.java files are stored) or packages
* A small dialog window pop up --> select OK
* On the left hand side, you will see UntitledModel. Click on the _classes, you will the class diagram
* To show the attributes/methods, point to a class, right click the mouse, select Show-->"Show All Compartment"
HTH,
Joyce