wrapper like library similar to libGdx for regular Apps?

Hey guys I’m very inexperienced with App development but programming in Java I’m decent ish. I’ve been using libGdx to make games and one of the cool things I like about it is that I only really have to write my source code once then it can be deoployed to Desktop Android iOS and HTML,

I want to write some applications that can help me in my day to day activities as a student. I can write them fine in just standard Java but is there some sort of wrapper like library similar to libGdx’s functionality that I just described that I can use so that I only really have to write the Source Code?

Or maybe I can just use libGdx? The app I’m thinking of writting are simple time table apps, reminders etc etc.