To jump to the source, click in the class name and press Alt-0.
To open the Javadoc documentation for a class, click in the class name and press Alt-F1.
For the jump-to-source shortcut to work, the source must be in a filesystem that is mounted in Filesystems. to work. For the jump-to-Javadoc shortcut to work, the documentation must be in a filesystem that is mounted with the Javadoc Manager.