java在JavaFX中使用Map和TableView

Question

我正在尝试在JavaFX的TableView中显示地图。下面的代码运行得很好，但我遇到的问题是，初始化后的任何未来地图更新都不会显示在TableView中

public class TableCassaController<K,V> extends TableView<Map.Entry<K,V>> implements Initializable {
@FXML   private TableColumn<K, V> column1;
@FXML   private TableColumn<K, V> column2;

   // sample data
    Map<String, String> map = new HashMap<>();
    map.put("one", "One");
    map.put("two", "Two");
    map.put("three", "Three");

public TableCassaController(ObservableMap<K,V> map, String col1Name, String col2Name) {
    System.out.println("Costruttore table");
    TableColumn<Map.Entry<K, V>, K> column1 = new TableColumn<>(col1Name);
    column1.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<Map.Entry<K, V>, K>, ObservableValue<K>>() {

        @Override
        public ObservableValue<K> call(TableColumn.CellDataFeatures<Map.Entry<K, V>, K> p) {
            // this callback returns property for just one cell, you can't use a loop here
            // for first column we use key
            return new SimpleObjectProperty<K>(p.getValue().getKey());
        }
    });

    TableColumn<Map.Entry<K, V>, V> column2 = new TableColumn<>(col2Name);
    column2.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<Map.Entry<K, V>, V>, ObservableValue<V>>() {

        @Override
        public ObservableValue<V> call(TableColumn.CellDataFeatures<Map.Entry<K, V>, V> p) {
            // for second column we use value
            return new SimpleObjectProperty<V>(p.getValue().getValue());
        }
    });

    ObservableList<Map.Entry<K, V>> items = FXCollections.observableArrayList(map.entrySet());

    this.setItems(items);
    this.getColumns().setAll(column1, column2);

}

现在，如果我尝试更新地图，这个更新不会显示在TableView中

Answer 1

使用ReadOnlyObjectWrapper

TableColumn<Map.Entry<K, V>, K> column1 = new TableColumn<>(col1Name);
column1.setCellValueFactory(param -> new ReadOnlyObjectWrapper<>(param.getValue().getKey())); 

TableColumn<Map.Entry<K, V>, V> column2 = new TableColumn<>(col2Name);
column2.setCellValueFactory(param -> new ReadOnlyObjectWrapper<>(param.getValue().getValue()));