TilePane.getHgap() has the following syntax.
public final double getHgap()
In the following code shows how to use TilePane.getHgap() method.
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.stage.Stage; /*from w ww.j a v a 2 s. co m*/ 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(), 450, 250); TilePane tile = new TilePane(); tile.setHgap(8); tile.setPrefColumns(4); for (int i = 0; i < 20; i++) { tile.getChildren().add(new CheckBox("CheckBox")); } System.out.println(tile.getHgap()); 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(); } }