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

chase singhofen
chase singhofen
3,811 Points

i had it correct and then i had to go back and re enter it. now i get 50 syntax errors.

i dont know why when i have to go back i have to answer all the questions over again if i have already answered them they should be simply that.

a simple answer for this is all i asked for. i am trying to get back to where i left off.

package com.example;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;

public class Home extends Application {

    public void start(Stage primaryStage) throws Exception{
        Group root = new Group();
        Button playButton = new Button();
      playButton.setOnAction(new EventHandler<ActionEvent>(){
         playButton.setOnAction(evt -> System.out.println("Playing!"));
            // Add an event handler for playButton

        primaryStage.setScene(new Scene(root, 300, 275));

    public static void main(String[] args) {

1 Answer

Jennifer Nordell
Jennifer Nordell
Treehouse Teacher

Hi there! I'm not sure what questions you're referring to, but the code needed for this challenge is only one line. The button is already created for you. And you had it mostly correct, but then you have some stray curly braces which are causing compiler errors. To be clear, this is not a problem with the challenge and should cause compiler errors with any Java compiler.

But here is the single line you're looking for:

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

This sets an action on the button that was already created for you and assigns an event that prints out "Playing!" when clicked.

Hope this helps! :sparkles:

chase singhofen
chase singhofen
3,811 Points

i had to start fresh from the module. it finally worked for me but i didnt change anything. so idk what happened and i dont want to question it.

im still working on another error in the next question.

i think i need to switch to front end. i think i understand that more