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Ich dachte an sowas

[code=Java]package fxmlloader;

import javafx.application.Application;

import javafx.fxml.FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.stage.Stage;

import java.io.IOException;

public class FxmlLoaderTest extends Application {

    @Override public void start(Stage stage) throws IOException {

        FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));

        Parent root = loader.load();

        MyController ctrl = loader.getController();

        ctrl.handleButtonAction();

        Scene scene = new Scene(root);

        stage.setScene(scene);

        stage.show();

    }

    public static void main(String[] parameters) {

        launch(parameters);

    }

}

[/code]

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

<?import javafx.scene.control.Button?>

<?import javafx.scene.control.CheckBox?>

<?import javafx.scene.control.Label?>

<?import javafx.scene.layout.AnchorPane?>

<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.111" fx:controller="fxmlloader.MyController">

    <children>

        <Button fx:id="button" layoutX="126" layoutY="90" onAction="#handleButtonAction" text="Click Me!" />

        <Label fx:id="label" layoutX="126" layoutY="120" minHeight="16" minWidth="69" />

    </children>

</AnchorPane>[/code]

[code=Java]package fxmlloader;

import javafx.fxml.FXML;

import javafx.scene.control.Button;

import javafx.scene.control.Label;

public class MyController {

    private int counter;

    @FXML

    Button button;

    @FXML

    Label label;

    public void handleButtonAction() {

        label.setText("clicked " + ++counter);

    }

}[/code]