如何在嵌套对象的TableView中显示数据？[副本]

Question

public class MarriageTableView extends AbstractTableViewController
{

    @FXML
    private TableView<Marriage> tableView;

    @FXML
    private TableColumn<Groom, String> groomFirstNameColumn;

    @FXML
    private TableColumn<Groom, String> groomLastNameColumn;

    @FXML
    private TableColumn<Bride, String> brideFirstNameColumn;

    @FXML
    private TableColumn<Bride, String> brideLastNameColumn;

    @FXML
    private TableColumn<Marriage, LocalDate> marriageDateColumn;
    
    @FXML
    void initialize()
    {
        this.groomFirstNameColumn.setCellValueFactory(new PropertyValueFactory<Groom, String>("firstName")); // <- Exception here
        this.groomLastNameColumn.setCellValueFactory(new PropertyValueFactory<Groom, String>("lastName"));
        this.brideFirstNameColumn.setCellValueFactory(new PropertyValueFactory<Bride, String>("firstName"));
        this.brideLastNameColumn.setCellValueFactory(new PropertyValueFactory<Bride, String>("lastName"));
        this.marriageDateColumn.setCellValueFactory(new PropertyValueFactory<Marriage, LocalDate>("marriageDate"));
    }

public class Marriage
{
    private Groom groom;
    private Bride bride;
    private LocalDate marriageDate;
}

public class Groom:
{
    private String firstName;
    private String lastName;
}

public class Bride:
{
    private String firstName;
    private String lastName;
}

java.lang.IllegalStateException: Cannot read from unreadable property firstName

Answer 1

一种选择是使用自定义单元格实现，该实现知道如何显示所需的groom和bride数据。例如：

TableColumn<Marriage, Groom> groomCol = ...;
groomCol.setCellValueFactory(new PropertyValueFactory<>("groom"));
groomCol.setCellFactory(tc -> new TableCell<>() {

  @Override
  protected void updateItem(Groom item, boolean empty) {
    super.updateItem(item, empty); // must be called
    if (empty || item == null) {
      setText(null);
    } else {
      // replace with desired format
      setText(item.getFirstName() + " " + item.getLastName());
    }
  }
});

请注意，tableColumn的第一个类型参数必须与tableView的类型参数匹配（在本例中是marriage)。

顺便说一句，您真的需要新郎和bride类吗？它们似乎具有相同的信息，并且可能组合成一个Person类。

// model class
public class Marriage {
  private final ObjectProperty<Groom> groom = new SimpleObjectProperty<>(this, "groom");
  public final void setGroom(Groom groom) { this.groom.set(groom); }
  public final Groom getGroom() { return groom.get(); }
  public final ObjectProperty<Groom> groomProperty() { return groom; }

  // other properties...
}

// table column configuration
TableColumn<Marriage, Groom> groomCol = ...;
groomCol.setCellValueFactory(data -> data.getValue().groomProperty());
groomCol.setCellFactory( ... );