JavaFX - 如何绑定Button文本属性

import javafx.application.Application;
import javafx.beans.binding.When;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class Main extends Application {

  public static void main(String[] args) {
    Application.launch(args);
  }

  @Override
  public void start(Stage stage) {
    Button b1 = new Button("B1");
    Button b2 = new Button("B2");
    Button b3 = new Button("B3");
    Button visibleBtn = new Button("Make Invisible");

    visibleBtn.setOnAction(e -> b2.setVisible(!b2.isVisible()));

    visibleBtn.textProperty().bind(
        new When(b2.visibleProperty()).then("Invisible").otherwise(
            "Visible"));

    b2.managedProperty().bind(b2.visibleProperty());

    HBox root = new HBox();
    root.getChildren().addAll(visibleBtn, b1, b2, b3);

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.setTitle("");
    stage.show();
  }
}