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package fxcontroller;

import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
 
public class Example3 extends Application {
    @Override
    public void start(Stage primaryStage) throws IOException {
        FXMLLoader fxmlLoader = new FXMLLoader();
        fxmlLoader.setController(new Example3Controller());
        Parent root = (Parent) fxmlLoader.load(this.getClass().getResourceAsStream("Example2.fxml"));
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

package fxcontroller;

import javafx.fxml.FXML;
import javafx.scene.control.TextField;
 
public class Example3Controller {
    @FXML
    private TextField textField;

    @FXML
	public void handleUpcaseAction() {
        textField.setText(textField.getText().toUpperCase());
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<?emfs /fxcontroller/Example4.fxml; ?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.HBox?>
 
<HBox xmlns:fx="http://javafx.com/fxml"
    fx:controller="fxcontroller.Example4Controller">
    <TextField fx:id="textField" text="Type something here!"/>
    <Button text="Click me!" onAction="#handleUpcaseAction"/>
</HBox>

package fxcontroller;

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

public class Example4 extends Application {
    @Override
    public void start(Stage primaryStage) throws IOException {
        Parent root = FXMLLoader.load(this.getClass().getResource("Example4.fxml"));
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}