JavaFX：如何使用具有相同超類的2個不同類填充表視圖

我有 3 個類，第一個是 Library Item，這是超類。另外兩個類是書籍和電影。當我想填充我的表格視圖時，我想確保在填充表格視圖時呼叫了正確的屬性。我知道為了便于使用，將導演和作者稱為相同的名稱更容易，但我想讓它用于學習目的。為了相關性，我省略了包和匯入。

圖書館專案類

public abstract class LibraryItem {
    private int itemCode;
    private String title;
    private boolean availability;
    private int memberIdentifier;
    private LocalDate dateLent;

    protected LibraryItem(int itemCode, String title, boolean availability, int memberIdentifier, LocalDate dateLent) {
        this.itemCode = itemCode;
        this.title = title;
        this.availability = availability;
        this.memberIdentifier = memberIdentifier;
        this.dateLent = dateLent;
    }

    public int getItemCode() {
        return itemCode;
    }

    public String getTitle() {
        return title;
    }

    public boolean isAvailability() {
        return availability;
    }

    public void setAvailability(boolean availability) {
        this.availability = availability;
    }

    public int getMemberIdentifier() {
        return memberIdentifier;
    }

    public void setMemberIdentifier(int memberIdentifier) {
        this.memberIdentifier = memberIdentifier;
    }

    public LocalDate getDateLent() {
        return dateLent;
    }

    public void setDateLent(LocalDate dateLent) {
        this.dateLent = dateLent;
    }
}

書類

public class Book extends LibraryItem {
    private String author;

    protected Book(int itemCode, String title, boolean isLent, int memberIdentifier, LocalDate dateLent, String author) {
        super(itemCode, title, isLent, memberIdentifier, dateLent);
        this.author = author;
    }
}

電影課

public class Movie extends LibraryItem {
    private String director;

    protected Movie(int itemCode, String title, boolean isLent, int memberIdentifier, LocalDate dateLent, String director) {
        super(itemCode, title, isLent, memberIdentifier, dateLent);
        this.director = director;
    }
}

我在想也許我可以對實施的每一行進行某種檢查，以便給出正確的值，

這是我的嘗試：

public class CollectionController implements Initializable {
    @FXML
    private TableView<LibraryItem> libraryItemsTable;
    @FXML
    private TableColumn<LibraryItem, String> itemCodeColumn;
    @FXML
    private TableColumn<LibraryItem, String>  availableColumn;
    @FXML
    private TableColumn<LibraryItem, String>  titleColumn;
    @FXML
    private TableColumn<LibraryItem, String>  authorDirectorColumn;
    private LibraryService libraryService = new LibraryService();

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        initializeTableView();
    }

    private void initializeTableView() {
        List<LibraryItem> libraryItems = libraryService.getLibraryItems();

        itemCodeColumn.setCellValueFactory(new PropertyValueFactory<>("itemCode"));
        availableColumn.setCellValueFactory(new PropertyValueFactory<>("availability"));
        titleColumn.setCellValueFactory(new PropertyValueFactory<>("title"));
        
        // implement here check for each new row
        if (checkIfBook(row))
            authorDirectorColumn.setCellValueFactory(new PropertyValueFactory<>("author"));
        else
            authorDirectorColumn.setCellValueFactory(new PropertyValueFactory<>("director"));
        //

        libraryItemsTable.getItems().addAll(libraryItems);
    }

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