JavaFX and Scene Builder - Writing text animation with threads

Controller.java

import com.jfoenix.controls.JFXButton;
import javafx.application.Platform;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.text.Text;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    TextAnimator textAnimator;

    @FXML
    private Text text;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {

        TextOutput textOutput = new TextOutput() {
            @Override
            public void writeText(String textOut) {
                Platform.runLater(new Runnable() {
                    @Override
                    public void run() {
                        text.setText(textOut);
                    }
                });
            }
        };

        textAnimator = new TextAnimator("Hello World!",
                100, textOutput);
    }

    @FXML
    void start(ActionEvent event) {
        Thread thread = new Thread(textAnimator);
        thread.start();
    }
}

Main.java

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import com.jfoenix.controls.JFXButton?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: #4e586e;" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <Text fx:id="text" fill="WHITE" layoutX="70.0" layoutY="231.0" strokeType="OUTSIDE" strokeWidth="0.0">
         <font>
            <Font size="75.0" />
         </font>
      </Text>
      <JFXButton buttonType="RAISED" layoutX="240.0" layoutY="339.0" onAction="#start" prefHeight="47.0" prefWidth="120.0" style="-fx-background-color: #ffffff;" text="Start" />
   </children>
</AnchorPane>

TextAnimator.java

import java.util.Random;

public class TextAnimator implements Runnable {

    private String text;
    private int animationTime;
    private TextOutput textOutput;
    private Random random = new Random();

    public TextAnimator(String text, int animationTime, TextOutput textField) {
        this.text = text;
        this.animationTime = animationTime;
        this.textOutput = textField;
    }

    @Override
    public void run() {

        try {
        for (int i = 0; i <= text.length(); i++) {
            String textAtThisPoint = text.substring(0,i);

                textOutput.writeText(textAtThisPoint);
                Thread.sleep(animationTime + random.nextInt(150));
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

TextOutput

public interface TextOutput {

    void writeText(String text);
}

Good snippet. It works well with Swing with minor tweaks. With Swing, Platform should be replaced with SwingUtilities. Here's my implementation:

    TextOutput textOutput = new TextOutput() {
        @Override
        public void writeText(String textOut) {
            SwingUtilities.invokeLater(() -> questionTextArea.setText(textOut));
        }
    };

    this.textAnimator = new TextAnimator(game.getCurrentQuestion(), 10, textOutput);
    new Thread(textAnimator).start();