Convert Android Application Components to Java Application

I want to attempt to rewrite my android application to a java application.
I'm sure I can rewrite the android ui to JavaFX, and the SQLite to MySQL, and all background calls using RxJava. The only issue I can't figure out is how do I handle my two separate screens.

The android has one Activity that sends an object to another activity.

Can someone please tell me what is the equivalent to this in a java app?
And if I want to open something similar to a DialogFragment, what can I use in a java app?

Thank you, if I can at least the reference to what I can research, that would be awesome.

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