We've not yet found a great way to show actual Java apps here at TNT.
That said, there's nothing stopping us from showing movie clips of Java apps in action. Many of them have been developed at our curricular site at CodeHS. In fact, when possible, we will even link you to some of those apps at our CHS sandbox!
Investigate the various demos below. In some cases, Java source code will be listed and you can see if you can translate it into another language like JavaScript.
Need some inspiration? Check out our OOP tribute to Java!
Review
Methods
Saga
Example