更改另一个类JavaFX中的标签文本

import javafx.scene.control.Label;

public class LabelChanger {
    public void changeLabelText(Label label, String newText) {
        label.setText(newText);
    }
}

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

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

    @Override
    public void start(Stage primaryStage) {
        Label label = new Label("原始文本");

        LabelChanger labelChanger = new LabelChanger();
        labelChanger.changeLabelText(label, "新的文本");

        VBox root = new VBox(label);
        Scene scene = new Scene(root, 200, 200);

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