Java Tooltip .graphicTextGapProperty ()

public final DoubleProperty graphicTextGapProperty()

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Tooltip;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;
/*  w  w  w .  j  a  v a  2  s  .com*/

public class Main extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) {
        Scene scene = new Scene(new Group());
        stage.setWidth(300);
        stage.setHeight(150);

        Button button = new Button("Hover Over Me");
        Tooltip toolTip = new Tooltip("Tooltip for Button");
        
        System.out.println(toolTip.graphicTextGapProperty());
        
        button.setTooltip(toolTip); 
        ((Group) scene.getRoot()).getChildren().add(button);

        stage.setScene(scene);
        stage.show();
    }
}