Java + cotlin code strictly for android, and how to quickly transfer to pc + windows?

Question

Software porting

It turns out the fastest if you install an android or a simulator on a pc?
I just want it as the slogan of the Javasts, I wrote it once and it works everywhere.
But it’s not very good to remake and mess around.
In what language should I code simple + offline 2d applications
in order to compile both apk and exe at once?
I mean, I coded for android, but it works in Windows just as well (with small quick improvements)
Is this theoretically possible?
Or is it even theoretically impossible? Really even on Java under Windows to alter for weeks?