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Java Build a JavaFX Application Graphical User Interfaces Adding an Event Handler

Posted by james white
james white
78,399 Points

Add an event handler for playButton

Here's my code:

playButton.setOnAction(new EventHandler<ActionEvent>(){
    @Override
    public void handle(ActionEvent event) {
        System.out.println("Playing!");
    }
});

I think I may be close but still getting "Bummer!" error on the Event Handler line...

The code is similar to the code on these pages:

https://docs.oracle.com/javafx/2/get_started/hello_world.htm

http://www.programcreek.com/java-api-examples/index.php?api=javafx.scene.control.Button

Any suggestions?

3 Answers

Craig Dennis
STAFF
Craig Dennis
Treehouse Teacher
Craig Dennis
Craig Dennis
Treehouse Teacher

Hi james white !

Try using a lambda like I do in the video leading up to this code challenge: Adding Interactivity at 3:40.

Let me know if that helps!

james white
james white
78,399 Points
james white
james white
78,399 Points

Hi Craig, Thanks! I thought it was too simple to be a one-liner like:

playButton.setOnAction(evt -> System.out.println("Playing!"));

Hope this JavaFX course is only the first of a series.

Maybe the next one can be a game with some OpenGL involved.

Craig Dennis
Craig Dennis
Treehouse Teacher
Craig Dennis
Craig Dennis
Treehouse Teacher

Hey James, great idea! Want me to add that to the Java content roadmap Trello board?

james white
james white
78,399 Points
james white
james white
78,399 Points

Yes please!

I bookmarked that Trello board (which I hadn't known existed) as a sort of "pre-Roadmap" page.

I see there is a "Swing Data" course planned (which is interesting to see what they do with

dashboard-ing graphics-created-on-the-fly for the data),

but having worked with Swing and SWT over the years,

I think JavaFX has more momentum going forward (at least with me).

I've done some work to integrate/overlay JavaFX with JME (JMonkey 3) and hopefully that

kind of thing pops up in a Treehouse course at some point.

Overall I know there's more Java content coming, it's just so agonizingly slow

watching the roadmap (and content creation) pipeline,

but keep up the good work. james