This is example of a state machine created using stateless4j library.
This example models a simple jukebox.
The above diagram encoded using stateless4j API:
var config = new StateMachineConfig<State, Trigger>(); config.configure(State.IDLE) .permit(Trigger.COIN_INSERTED, State.SELECTION); config.configure(State.SELECTION) .onEntry(Main::showSongsList) .onExit(Main::hideSongsList) .permit(Trigger.START, State.PLAYING, Main::consumeCoin) .permit(Trigger.CANCEL, State.IDLE, Main::returnCoin); config.configure(State.RUNNING) .onEntry(Main::showTimer) .onExit(Main::hideTimer) .permit(Trigger.STOP, State.IDLE); config.configure(State.PLAYING) .substateOf(State.RUNNING) .onEntry(Main::playSong) .permit(Trigger.PAUSE, State.PAUSED); config.configure(State.PAUSED) .substateOf(State.RUNNING) .onEntry(Main::pauseSong) .permit(Trigger.RESUME, State.PLAYING); Refer to full example source code
Diagram is created using PlantUML. You can install PlantUML plugin for JetBrains IDEA to enjoy real-time preview. See top of Main class.