How to join in navigation in JmonkeyEngine, such as some properties of game characters, and this requires only two-dimensional display on the line. How to add swing components.
two tutorials:
https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:advanced:swing_canvas
https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:advanced:hud
You can install the “GUI Editor” plugin to edit swing GUI visually as well.