r/javahelp post code

public class HUDPane extends BorderPane implements Serializable {
    public HUDPane(Parent root) {
        setCenter(root);
        setTop(new MenuBar(new Menu("Pen") {{
            getItems().addAll(new Menu("Color") {{
                getItems().addAll(new MenuItem() {{
                    setGraphic(new TilePane(2, 2) {{
                        setPrefColumns(8);

                        Color[] colors = {
                                Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.BLUE, Color.CYAN, Color.PURPLE, Color.PINK,
                                Color.WHEAT, Color.SANDYBROWN, Color.SADDLEBROWN, Color.BLACK, Color.DARKGRAY, Color.GRAY, Color.LIGHTGRAY, Color.WHITE
                        };

                        ObservableList<Node> children = getChildren();

                        for (Color color : colors) {
                            children.add(new Button() {{
                                setMinSize(16, 16);
                                setMaxSize(16, 16);
                                setStyle("-fx-background-color: " + toHex(color) + ";");
                                setOnAction(event -> penColor = color);
                            }});
                        }
                    }});
                }});
            }}, new Menu("Size") {{
                getItems().addAll(new MenuItem() {{

                }});
            }});
        }}));
    }
}

public String toHex(Color color) {
    return String.format("#%02X%02X%02X",
            (int) (color.getRed() * 255),
            (int) (color.getGreen() * 255),
            (int) (color.getBlue() * 255));
}