如何在java fx 2中使用独立日历选择日期(而不是日期选择器)？

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

import java.util.Calendar;

public class CalendarApp extends Application {

    private TextField dateField;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Calendar App");

        // 创建文本字段用于显示选择的日期
        dateField = new TextField();
        dateField.setEditable(false);

        // 创建按钮，点击按钮时弹出日历窗口
        Button calendarButton = new Button("选择日期");
        calendarButton.setOnAction(e -> showCalendar());

        // 创建布局并添加控件
        GridPane gridPane = new GridPane();
        gridPane.setPadding(new Insets(10));
        gridPane.setHgap(10);
        gridPane.setVgap(10);
        gridPane.add(dateField, 0, 0);
        gridPane.add(calendarButton, 1, 0);

        // 创建场景并显示
        Scene scene = new Scene(gridPane, 300, 50);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void showCalendar() {
        // 创建日历窗口并显示
        Stage calendarStage = new Stage();
        calendarStage.setTitle("Calendar");

        // 创建日历界面
        GridPane calendarPane = new GridPane();
        calendarPane.setPadding(new Insets(10));
        calendarPane.setHgap(10);
        calendarPane.setVgap(10);

        // 获取当前日期
        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);

        // 在表格中显示日期
        for (int row = 0; row < 6; row++) {
            for (int col = 0; col < 7; col++) {
                // 计算日期
                int day = row * 7 + col + 1;
                if (day <= 31) {
                    // 在表格中显示日期
                    Button dayButton = new Button(String.valueOf(day));
                    dayButton.setOnAction(e -> {
                        // 返回选择的日期
                        dateField.setText(year + "-" + (month + 1) + "-" + day);
                        calendarStage.close();
                    });
                    calendarPane.add(dayButton, col, row);
                }
            }
        }

        // 创建场景并显示
        Scene calendarScene = new Scene(calendarPane, 300, 200);
        calendarStage.setScene(calendarScene);
        calendarStage.show();
    }

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