Javafx tableview具有来自多个类的数据

Question

我可以用来自1个班级的不同数据填充表格视图。但这不适用于多个班级。知道如何解决吗？我已经检查了关于stackoverflow的类似问题。但是他们都帮不了我。如果您对“回调”类有任何建议，请提供完整的导入信息，因为那里有几个回调类。

public class MainViewController implements Initializable {

    @FXML
    private TableColumn<TaskControl, Boolean> colErledigt;

    @FXML
    private TableColumn<TaskControl, Character> colPrioritaet;

    @FXML
    private TableColumn<TaskControl, String> colBeschreibung;


    @FXML
    private TableColumn<ProjectControl, String> colProjekt;


    @FXML
    private TableView<TaskControl> tblView;





    public final void initialize(final URL location,
            final ResourceBundle resources) {

        initializeTableElements();

    }


    public final void initializeTableElements() {
        colBeschreibung
                .setCellValueFactory(new PropertyValueFactory<>("description"));

        colPrioritaet
                .setCellValueFactory(new PropertyValueFactory<>("priority"));


        colProjekt.setCellValueFactory(new PropertyValueFactory<>("name"));


        colErledigt.setMaxWidth(50);
        colErledigt.setCellValueFactory(
                new PropertyValueFactory<TaskControl, Boolean>("isDone"));
        colErledigt
                .setCellFactory(CheckBoxTableCell.forTableColumn(colErledigt));
        colErledigt.setEditable(true);

        try {
            tblView.setItems(getObsTasks());
        } catch (IDNotValidException | StringNotValidException e1) {
            System.out.print("FEHLER beim getObsTasks");
        }

        tblView.setEditable(true);
    }


    public ObservableList<TaskControl> getObsTasks()
            throws IDNotValidException, StringNotValidException {

        ObservableList<TaskControl> obsTasks = FXCollections
                .observableArrayList();

        Map<Context, Set<Task>> test = TasksContextUtility.INSTANCE
                .getAllContextsAndTasks();

        test.values().forEach(v -> {
            v.forEach(b -> obsTasks.add((TaskControl) b));
        });

        return obsTasks;
    }

进一步的问题：如何在TableCell的HashSet中显示实例的某个属性。所以我在TaskControl类中有一个HashSet。在该HashSet中，有“
ProjectControl”类的实例。每个ProjectControl实例都具有“名称”或“ id”等属性。

我想尽可能地在一个表单元格中表示项目实例的所有名称。可能是用逗号分隔的字符串（project1，project2，project3 …）。

我的TaskControl类继承自这个类的Task类（简化了很多）

public abstract class Task
  implements Serializable, IDValidatable
{
  private int id;
  private char priority = ' ';
  private final Set<Project> projects = new HashSet();

  public Task(int oid)
    throws IDNotValidException
  {
    if (isIDValid(oid)) {
      this.id = oid;
    } else {
      throw new IDNotValidException("The ID you have specified is not valid!")
      {
        private static final long serialVersionUID = 99044660889990790L;
      };
    }
  }

  public final void setId(int oid)
    throws IDNotValidException
  {
    if (isIDValid(oid)) {
      this.id = oid;
    } else {
      throw new IDNotValidException("The ID you have specified is not valid!")
      {
        private static final long serialVersionUID = 99044660889990790L;
      };
    }
  }

  public final int getId()
  {
    return this.id;
  }

  public final Collection<Context> getContexts()
  {
    return this.contexts;
  }

  public final void addContext(Context context)
    throws ContextNotValidException
  {
    this.contexts.add(context);
  }

  public final void removeContext(Context context)
    throws ContextNotValidException
  {
    this.contexts.remove(context);
  }

  public final Collection<Project> getProjects()
  {
    return this.projects;
  }

  public final void addProject(Project project)
    throws ProjectNotValidException
  {
    this.projects.add(project);
  }

  public final void removeProject(Project project)
    throws ProjectNotValidException
  {
    this.projects.remove(project);
  }

  public final Map<String, String> getAddons()
  {
    return this.addons;
  }
}

Answer 1

通过向我的TaskControl添加一个额外的String来解决它，该String包含它包含的所有项目的名称。它通过在为表列创建ObservableList之前调用的函数获取名称。

private String projectsAsString;
    ...
public final void convertProjectsToString() {

    String projects = "";

    for (Project p : this.getProjects()) {
        ProjectControl pp = (ProjectControl) p;
        projects += pp.getName() + ", ";
    }
    if (projects != null && projects != "" && projects.length() > 4) {
        projects = projects.substring(0, projects.length() - 2);
    }
    this.projectsAsString = projects;
}

无论如何，谢谢你们对我的帮助。