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 * and open the template in the editor.
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package javafxapplication13;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.application.Platform;
import javafx.scene.layout.VBox;

/**
 *
 * @author Jean
 */
public class JavaFXApplication13 extends Application {

    /**
     * @param args the command line arguments
     */
    
    
    private TextBox ed1 = new TextBox();
    private TextBox ed2 = new TextBox();
    private TextBox ed3 = new TextBox();
    private TextBox ed4 = new TextBox();
    
    public static void main(String[] args) {
        Application.launch(JavaFXApplication13.class, args);
    }
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World");
        Group root = new Group();
        VBox vb = new VBox();
        System.out.println(vb.getHeight());
        Scene scene = new Scene(root, 300, 250, Color.LIGHTGREEN);
        Button btn = new Button();
        btn.setText("Hello World");
        root.getChildren().add(vb);       
        System.out.println(vb.getHeight());
        System.out.println(vb.getLayoutBounds());
        System.out.println(vb.getBoundsInLocal());
        System.out.println(vb.getBoundsInParent());
        vb.getChildren().add(btn);        
        System.out.println(vb.getHeight());
        System.out.println(vb.getLayoutBounds());
        System.out.println(vb.getBoundsInLocal());
        System.out.println(vb.getBoundsInParent());
        vb.getChildren().add(ed1);        
        System.out.println(vb.getHeight());
        System.out.println(vb.getLayoutBounds());
        System.out.println(vb.getBoundsInLocal());
        System.out.println(vb.getBoundsInParent());
        vb.getChildren().add(ed2);        
        System.out.println(vb.getHeight());
        System.out.println(vb.getLayoutBounds());
        System.out.println(vb.getBoundsInLocal());
        System.out.println(vb.getBoundsInParent());
        vb.getChildren().add(ed3);        
        System.out.println(vb.getHeight());
        System.out.println(vb.getLayoutBounds());
        System.out.println(vb.getBoundsInLocal());
        System.out.println(vb.getBoundsInParent());
        vb.getChildren().add(ed4);       
        System.out.println(vb.getHeight());
        System.out.println(vb.getLayoutBounds());
        System.out.println(vb.getBoundsInLocal());
        System.out.println(vb.getBoundsInParent());
        
        
        
        
        ed2.focusedProperty().addListener(new ChangeListener<Boolean>() {

            public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                if (oldValue != newValue) {
                if (ed2.getRawText().length()<5) {
                     Platform.runLater(new Runnable() {

                        public void run() {
                            ed2.requestFocus();
                        }
                    });
                             
                    System.out.println("ops");
                }
                }
            }
        });
        primaryStage.setScene(scene);
        primaryStage.setVisible(true);
    }
}