I have an existing Java program on my computer. The current UI is terminal and typing based. I am interesting in using App Inventor to design just the UI portion of the app and then run the Java program in the background to handle the game logic.
Is this possible?
If you can refactor your Java program so that it can be run as a server that is connected to the internet and has a web-based API (e,g, REST), then you could write an App Inventor app that interacts with it using App Inventor's Web component.
Hope this helps.
-Mark
If the logic really is such that it only have a command line interface, you could package it into an extension and provide some blocks to wrap whatever functions are called by the CLI.