在JavaFX中单击时是否保存ArrayList中的元素？

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
    private ObservableList<String> arrayList;

    @Override
    public void start(Stage primaryStage) {
        arrayList = FXCollections.observableArrayList();
        
        Button addButton = new Button("Add Element");
        addButton.setOnAction(event -> {
            arrayList.add("New Element");
        });
        
        Button printButton = new Button("Print Elements");
        printButton.setOnAction(event -> {
            System.out.println(arrayList);
        });
        
        VBox root = new VBox(addButton, printButton);
        Scene scene = new Scene(root, 200, 200);
        
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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