JavaFX如何在TableView中计算select行

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;

public class TableViewExample extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        // 创建数据源
        ObservableList<Person> data = FXCollections.observableArrayList(
                new Person("John", "Doe"),
                new Person("Jane", "Smith"),
                new Person("Bob", "Johnson")
        );

        // 创建TableView
        TableView<Person> tableView = new TableView<>();
        tableView.setItems(data);

        // 创建列
        TableColumn<Person, String> firstNameColumn = new TableColumn<>("First Name");
        firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));

        TableColumn<Person, String> lastNameColumn = new TableColumn<>("Last Name");
        lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));

        // 将列添加到TableView
        tableView.getColumns().add(firstNameColumn);
        tableView.getColumns().add(lastNameColumn);

        // 设置选择模式为MULTIPLE
        tableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

        // 获取选择模型对象
        MultipleSelectionModel<Person> selectionModel = tableView.getSelectionModel();

        // 监听选中行的变化
        selectionModel.getSelectedItems().addListener((ListChangeListener<Person>) change -> {
            while (change.next()) {
                if (change.wasAdded()) {
                    // 选中行发生变化
                    for (Person person : change.getAddedSubList()) {
                        // 对选中的行数据进行计算操作
                        System.out.println("Selected: " + person.getFirstName() + " " + person.getLastName());
                    }
                }
            }
        });

        // 创建场景并显示
        Scene scene = new Scene(tableView);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static class Person {
        private String firstName;
        private String lastName;

        public Person(String firstName, String lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
        }

        public String getFirstName() {
            return firstName;
        }

        public String getLastName() {
            return lastName;
        }
    }
}