java - What are the connections and differences between Observables in JavaFX and RxJava

Question

Generally, an observable is something whose changes can be observed.

In JavaFX, an Observable is used to represent a state of UI. With its subclass Property we can manually getValue and setValue and then its value and other subscribed values are updated accordingly.

I am new to RxJava. However from what I have learned, an Observable is more like a lazy list whose elements are generated when needed, but how they are generated is determined when creating the Observable and it's not subject to later change.

What are the connections and differences between the two? Is it possible to replace one with the other?

And understanding them in 2 different ways also makes the definitions of some functional transformations ambiguous. For example, when combining observables we might use bind/flatMap or zip. (also see this related question) For a state, in the sense of functional reactive programming, the result represents the current combined and then transformed state, which just depends on the current state of its 2 dependencies. For a lazy list, flatMap creates the cartesian product of 2 lists and transforms them, and zip pairs 2 lists by order instead of by current state or time.

Answer 1

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