Java TilePane(double hgap, double vgap) Constructor

public TilePane(double hgap,
  double vgap)

//  w  w w .  ja va 2 s  .  co m
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.layout.HBox;
import javafx.scene.layout.TilePane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

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

    @Override public void start(Stage stage) {
        stage.setTitle("TitledPane");
        Scene scene = new Scene(new Group(), 450, 250);
        scene.setFill(Color.GHOSTWHITE);

        TilePane tile = new TilePane(0.3,0.5);
        tile.setHgap(8);
        tile.setPrefColumns(4);
        for (int i = 0; i < 20; i++) {
            tile.getChildren().add(new CheckBox("asdf"));
        }
        
        HBox hbox = new HBox(10);
        hbox.setPadding(new Insets(20, 0, 0, 20));
        hbox.getChildren().setAll(tile);

        Group root = (Group)scene.getRoot();
        root.getChildren().add(hbox);
        stage.setScene(scene);
        stage.show();
    }
}