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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@asez73
Hello and hapy new year,
Simply said: espruino is a javascript interpreter and a set of boards. Java is in no way able to run on the boards that run espruino.
As the interpreter is written in C/C++, you should certainly be able to use C or C++ on the board that is running it so far.
You could also see this thread if you need to add some C/C++ functionalities to the interpreter.
See your board manufacturer for further details about dev environnement.