Here is another JavaFx demo that I've been building. It is a simple implementation of John Conway's "Game of Life".
The demo is a simple simulator, just click on the boxes to turn them "on" or "off". When you are ready, click on the "start" button to begin the simulation. You can increase the speed at which the simulation runs by moving the slider up and down. You can also step through the simulation by clicking the "Enter" or "Return" key.
Here are the links
Java WebStart: link
Java Applet: link
Here's a link to the source code, link.