ClassCastExceptionがTableColumnの

Question

を編集しながら、私は次のコードのquantityColumnを編集可能に設定したい：

public class ControladorView implements Initializable { 

    @FXML private MenuItem mNew, mOpen, mSave, mPrint; 

    @FXML 
    private MenuButton mCategory; 

    @FXML private Button bAccept, bCancel, bAdd, bRemove, bClear; 

    @FXML private TableView tableViewItem; 
    @FXML private TableColumn<Product, String> nameItemColumn; 
    @FXML private TableColumn<Product, Double> priceColumn; 
    @FXML private TableColumn<Product, Integer> availableColumn; 

    private ObservableList<Product> itemData; 

    @FXML private TableView tableViewBudget; 
    @FXML private TableColumn<Product, String> nameBudgetColumn; 
    @FXML private TableColumn<Product, Double> outTaxColumn; 
    @FXML private TableColumn<Product, Double> inTaxColumn; 
    @FXML private TableColumn<Product, Integer> quantityColumn; 

    private ObservableList<Product> budgetData; 

    @FXML private TextField tFName, tFMin, tFMax; 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 
     //Items Table 
     nameItemColumn.setCellValueFactory(
      new PropertyValueFactory<>("description")); 
     priceColumn.setCellValueFactory(
      new PropertyValueFactory<>("price")); 
     availableColumn.setCellValueFactory(
      new PropertyValueFactory<>("stock")); 

     //Se utiliza para Añadir 
     itemData = FXCollections.observableArrayList(); 

     //Budget Table 
     nameBudgetColumn.setCellValueFactory(
      new PropertyValueFactory<>("description")); 
     inTaxColumn.setCellValueFactory(
      new PropertyValueFactory<>("price")); 
     outTaxColumn.setCellValueFactory(cellData -> 
      new SimpleDoubleProperty(cellData.getValue().getPrice() * 0.79).asObject()); 
     nameBudgetColumn.setCellFactory(tc -> new TextFieldTableCell<>()); 

     //Se utiliza para Eliminar y Limpiar 
     budgetData = FXCollections.observableArrayList(); 
     tableViewBudget.setItems(budgetData); 

     //Bindings Filter 
     final BooleanBinding noFiltOp = Bindings.equal(mCategory.textProperty(), "Categoría").or(
             Bindings.equal(mCategory.textProperty(), "Categoría").and(
             Bindings.isEmpty(tFMin.textProperty())).and(
             Bindings.isEmpty(tFMax.textProperty()))).or(
             Bindings.equal(mCategory.textProperty(), "Categoría").and(
             Bindings.isEmpty(tFName.textProperty()))).or(
             Bindings.equal(mCategory.textProperty(), "Categoría").and(
             Bindings.isEmpty(tFName.textProperty())).and(
             Bindings.isEmpty(tFMin.textProperty())).and(
             Bindings.isEmpty(tFMax.textProperty()))); 

     final BooleanBinding noCancel = Bindings.isEmpty(tFName.textProperty()).and(
             Bindings.equal(mCategory.textProperty(), "Categoría")).and(
             Bindings.isEmpty(tFMin.textProperty())).and(
             Bindings.isEmpty(tFMax.textProperty())); 

     //Bindings Item 
     final BooleanBinding noItemSelectedI = Bindings.isNull(
      tableViewItem.getSelectionModel().selectedItemProperty()); 

     //Bindings Budget 
     final BooleanBinding noItemSelectedB = Bindings.isNull(
      tableViewBudget.getSelectionModel().selectedItemProperty()); 
     final BooleanBinding emptyBudget = Bindings.isEmpty(tableViewBudget.getItems()); 

     //Disable buttons 
     bAccept.disableProperty().bind(noFiltOp); 
     bCancel.disableProperty().bind(noCancel); 
     bAdd.disableProperty().bind(noItemSelectedI); 
     bRemove.disableProperty().bind(noItemSelectedB); 
     bClear.disableProperty().bind(emptyBudget); 
    } 

    @FXML 
    private void onSelect(ActionEvent event) { 
     mCategory.setText(((MenuItem) event.getSource()).getText()); 
    } 

    @FXML 
    private void onAccept(ActionEvent event) { 
     Category op = Product.Category.POWER_SUPPLY; 
     switch(mCategory.getText()) { 
      case "Placas Base": op = Product.Category.MOTHERBOARD; break; 
      case "Procesadores": op = Product.Category.CPU; break; 
      case "Memorias RAM": op = Product.Category.RAM; break; 
      case "Tarjetas gráficas": op = Product.Category.GPU; break; 
      case "HDD": op = Product.Category.HDD; break; 
      case "SSD": op = Product.Category.HDD_SSD; break; 
      case "Torres": op = Product.Category.CASE; break; 
      case "Teclados": op = Product.Category.KEYBOARD; break; 
      case "Ratones": op = Product.Category.MOUSE; break; 
      case "Monitores": op = Product.Category.SCREEN; break; 
      case "Altavoces": op = Product.Category.SPEAKER; break; 
      case "Multilectores": op = Product.Category.MULTIREADER; break; 
      case "Grabadoras": op = Product.Category.DVD_WRITER; break; 
      case "Ventiladores": op = Product.Category.FAN; break; 
     } 

     //Condiciones (true) para metodos Database 
     final boolean cat = !mCategory.getText().equals("Categoría"), 
         des = !tFName.getText().isEmpty(), 
         min = !tFMin.getText().isEmpty(), 
         max = !tFMax.getText().isEmpty(); 

     if(cat && des && min && max) 
      tableViewItem.getItems().setAll(
       Database.getProductByCategoryDescriptionAndPrice(
        op, tFName.getText(), Double.parseDouble(tFMin.getText()), 
        Double.parseDouble(tFMax.getText()), true)); 
     else if(cat && min && max) 
      tableViewItem.getItems().setAll(
       Database.getProductByCategoryAndPrice(
        op, Double.parseDouble(tFMin.getText()), 
        Double.parseDouble(tFMax.getText()), true)); 
     else if(cat && des) 
      tableViewItem.getItems().setAll(
       Database.getProductByCategoryAndDescription(
        op, tFName.getText(), true)); 
     else tableViewItem.getItems().setAll(Database.getProductByCategory(op)); 
    } 

    @FXML 
    private void onCancel(ActionEvent event) { 
     tFName.clear(); 
     mCategory.setText("Categoría"); 
     tFMin.clear(); 
     tFMax.clear(); 
     tableViewItem.getItems().clear(); 
    } 

    @FXML 
    private void onAdd(ActionEvent event) { 
     Product prod = 
      ((Product) tableViewItem.getSelectionModel().selectedItemProperty().getValue());  
     if(!budgetData.isEmpty()) { 
      Product[] elArray = new Product[budgetData.size()]; 
      elArray = budgetData.toArray(elArray); 
      Category cat = prod.getCategory(); 
      try { 
       int i = 0; 
       while(!elArray[i].getCategory().equals(cat)) i++; 
      } catch(ArrayIndexOutOfBoundsException e) { 
       budgetData.add(prod); 
      } 
     } else budgetData.add(prod); 
    } 

    @FXML 
    private void onRemove(ActionEvent event) { 
     budgetData.remove(tableViewBudget.getSelectionModel().getSelectedIndex()); 
    } 

    @FXML 
    private void onClear(ActionEvent event) { 
     tableViewBudget.getItems().clear(); 
    } 
} 

私は（ProductがProductoにキャストすることができない多くのことをしようとしたが、常にProductとProducto間ClassCastExceptionをスローします）。だから私はオリジナルのコントローラクラスを投稿することに決めました。

Productクラス：

public class Product { 
    public enum Category { 
     SPEAKER, HDD, HDD_SSD, POWER_SUPPLY, DVD_WRITER, RAM, SCREEN, 
     MULTIREADER, MOTHERBOARD, CPU, MOUSE, GPU, KEYBOARD, CASE, FAN 
    } 

    public Product(String description, double price, int stock, Category category) { 
     this.description = description; 
     this.price = price; 
     this.stock = stock; 
     this.category = category; 
    } 

    public Category getCategory() { 
     return category; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public double getPrice() { 
     return price; 
    } 

    public int getStock() { 
     return stock; 
    } 

    private final String description; 
    private final double price; 
    private final int stock; 
    private final Category category; 
} 

Productoクラス：

public class Producto extends Product { 
    private int cantidad; 

    public Producto(String description, double price, int stock, Category category) { 
     super(description, price, stock, category); 
     this.cantidad = 1; 
    } 

    public int getCantidad() { 
     return cantidad; 
    } 

    public void setCantidad(int i) { 
     cantidad = i; 
    } 
} 

FXMLコード：

<?xml version="1.0" encoding="UTF-8"?> 

<?import javafx.geometry.Insets?> 
<?import javafx.scene.control.Accordion?> 
<?import javafx.scene.control.Button?> 
<?import javafx.scene.control.Label?> 
<?import javafx.scene.control.Menu?> 
<?import javafx.scene.control.MenuBar?> 
<?import javafx.scene.control.MenuButton?> 
<?import javafx.scene.control.MenuItem?> 
<?import javafx.scene.control.TableColumn?> 
<?import javafx.scene.control.TableView?> 
<?import javafx.scene.control.TextField?> 
<?import javafx.scene.control.TitledPane?> 
<?import javafx.scene.layout.HBox?> 
<?import javafx.scene.layout.VBox?> 
<?import javafx.scene.text.Font?> 

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="configuradordepc.controller.ControladorView"> 
    <children> 
     <MenuBar> 
     <menus> 
      <Menu mnemonicParsing="false" text="Archivo"> 
       <items> 
        <MenuItem fx:id="mNew" mnemonicParsing="false" text="Nuevo" /> 
        <MenuItem fx:id="mOpen" mnemonicParsing="false" text="Abrir" /> 
        <MenuItem fx:id="mSave" mnemonicParsing="false" text="Guardar" /> 
        <MenuItem fx:id="mPrint" mnemonicParsing="false" text="Imprimir" /> 
       </items> 
      </Menu> 
     </menus> 
     </MenuBar> 
     <Accordion VBox.vgrow="ALWAYS"> 
     <panes> 
      <TitledPane animated="false" text="Nuevo PC"> 
       <content> 
        <VBox fx:id="vBox" spacing="10.0"> 
        <children> 
         <HBox spacing="10.0" VBox.vgrow="ALWAYS"> 
          <children> 
           <VBox alignment="TOP_CENTER" spacing="10.0"> 
           <children> 
            <Label text="Filtrar Productos"> 
             <font> 
              <Font name="System Bold" size="12.0" /> 
             </font> 
            </Label> 
            <HBox alignment="CENTER"> 
             <children> 
              <Label prefWidth="87.0" text="Nombre" /> 
              <TextField fx:id="tFName" HBox.hgrow="ALWAYS" /> 
             </children> 
            </HBox> 
            <MenuButton fx:id="mCategory" maxWidth="1.7976931348623157E308" mnemonicParsing="false" text="Categoría"> 
             <items> 
              <MenuItem fx:id="mMother" mnemonicParsing="false" onAction="#onSelect" text="Placas base" /> 
              <MenuItem fx:id="mCPU" mnemonicParsing="false" onAction="#onSelect" text="Procesadores" /> 
              <MenuItem fx:id="mRAM" mnemonicParsing="false" onAction="#onSelect" text="Memorias RAM" /> 
              <MenuItem fx:id="mGPU" mnemonicParsing="false" onAction="#onSelect" text="Tarjetas gráficas" /> 
              <MenuItem fx:id="mHDD" mnemonicParsing="false" onAction="#onSelect" text="HDD" /> 
              <MenuItem fx:id="mSSD" mnemonicParsing="false" onAction="#onSelect" text="SSD" /> 
              <MenuItem fx:id="mCase" mnemonicParsing="false" onAction="#onSelect" text="Torres" /> 
              <MenuItem fx:id="mKey" mnemonicParsing="false" onAction="#onSelect" text="Teclados" /> 
              <MenuItem fx:id="mMouse" mnemonicParsing="false" onAction="#onSelect" text="Ratones" /> 
              <MenuItem fx:id="mScreen" mnemonicParsing="false" onAction="#onSelect" text="Monitores" /> 
              <MenuItem fx:id="mSpeak" mnemonicParsing="false" onAction="#onSelect" text="Altavoces" /> 
              <MenuItem fx:id="mMulti" mnemonicParsing="false" onAction="#onSelect" text="Multilectores" /> 
              <MenuItem fx:id="mDVD" mnemonicParsing="false" onAction="#onSelect" text="Grabadoras" /> 
              <MenuItem fx:id="mFan" mnemonicParsing="false" onAction="#onSelect" text="Ventiladores" /> 
              <MenuItem fx:id="mPower" mnemonicParsing="false" onAction="#onSelect" text="Fuentes de alimentación" /> 
             </items> 
            </MenuButton> 
            <HBox alignment="CENTER_LEFT"> 
             <children> 
              <Label prefWidth="87.0" text="Precio Mín." /> 
              <TextField fx:id="tFMin" HBox.hgrow="ALWAYS" /> 
             </children> 
            </HBox> 
            <HBox alignment="CENTER_LEFT"> 
             <children> 
              <Label prefWidth="87.0" text="Precio Máx." /> 
              <TextField fx:id="tFMax" HBox.hgrow="ALWAYS" /> 
             </children> 
            </HBox> 
            <HBox alignment="CENTER" spacing="10.0"> 
             <children> 
              <Button fx:id="bAccept" mnemonicParsing="false" onAction="#onAccept" text="Aceptar" /> 
              <Button fx:id="bCancel" mnemonicParsing="false" onAction="#onCancel" text="Cancelar" /> 
             </children> 
            </HBox> 
           </children> 
           <HBox.margin> 
            <Insets top="4.0" /> 
           </HBox.margin> 
           </VBox> 
           <VBox alignment="CENTER" spacing="10.0" HBox.hgrow="ALWAYS"> 
           <HBox.margin> 
            <Insets /> 
           </HBox.margin> 
           <children> 
            <TableView fx:id="tableViewItem" VBox.vgrow="ALWAYS"> 
             <columns> 
              <TableColumn editable="false" prefWidth="75.0" sortable="false" text="Productos"> 
              <columns> 
               <TableColumn fx:id="nameItemColumn" editable="false" prefWidth="75.0" sortable="false" text="Nombre" /> 
               <TableColumn fx:id="priceColumn" editable="false" prefWidth="75.0" sortable="false" text="Precio" /> 
               <TableColumn fx:id="availableColumn" editable="false" prefWidth="75.0" sortable="false" text="Disponibilidad" /> 
              </columns> 
              </TableColumn> 
             </columns> 
             <columnResizePolicy> 
              <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" /> 
             </columnResizePolicy> 
            </TableView> 
            <Button fx:id="bAdd" mnemonicParsing="false" onAction="#onAdd" text="Añadir" /> 
           </children> 
           </VBox> 
           <VBox spacing="10.0" HBox.hgrow="ALWAYS"> 
           <children> 
            <TableView fx:id="tableViewBudget" editable="true" VBox.vgrow="ALWAYS"> 
             <columns> 
              <TableColumn prefWidth="75.0" sortable="false" text="Presupuesto"> 
              <columns> 
               <TableColumn fx:id="nameBudgetColumn" editable="false" prefWidth="75.0" sortable="false" text="Nombre" /> 
               <TableColumn fx:id="outTaxColumn" editable="false" prefWidth="75.0" sortable="false" text="Sin IVA" /> 
               <TableColumn fx:id="inTaxColumn" editable="false" prefWidth="75.0" sortable="false" text="Con IVA" /> 
               <TableColumn fx:id="quantityColumn" prefWidth="75.0" sortable="false" text="Cantidad" /> 
              </columns> 
              </TableColumn> 
             </columns> 
             <columnResizePolicy> 
              <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" /> 
             </columnResizePolicy> 
            </TableView> 
            <HBox alignment="CENTER" spacing="10.0"> 
             <children> 
              <Button fx:id="bRemove" mnemonicParsing="false" onAction="#onRemove" text="Eliminar" /> 
              <Button fx:id="bClear" mnemonicParsing="false" onAction="#onClear" text="Limpiar" /> 
             </children> 
            </HBox> 
           </children> 
           </VBox> 
          </children> 
         </HBox> 
        </children> 
        <padding> 
         <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" /> 
        </padding> 
        </VBox> 
       </content> 
      </TitledPane> 
      <TitledPane animated="false" text="Configuraciones" /> 
     </panes> 
     </Accordion> 
    </children> 
</VBox> 

Answer 1

Map<Product, ObjectProperty<Integer>>を使用して数量を保存することができます。これはequalsに対して異なるペアごとのように、リスト内のすべての項目を必要とするという

は

final int defaultValue = 0; 

Map<StringItem, ObjectProperty<Integer>> map = new HashMap<>(); 

// fill map with existing keys 
budgetData.forEach(i -> map.put(i, new SimpleObjectProperty(defaultValue))); 

// update map on change of list 
budgetData.addListener((ListChangeListener.Change<? extends StringItem> c) -> { 
    while (c.next()) { 
     c.getRemoved().forEach(map::remove); 
     c.getAddedSubList().forEach(i -> map.put(i, new SimpleObjectProperty(defaultValue))); 
    } 
}); 

// use value in map as value for column 
quantityColumn.setCellValueFactory(d -> map.get(d.getValue())); 
quantityColumn.setCellFactory(TextFieldTableCell.forTableColumn(new IntegerStringConverter())); 

注意。この条件が満たされない場合は、TableViewのアイテムタイプとして一意のキーを使用し、数量と元のアイテムタイプをマップに関連付けなければなりません。

Answer 2

あなたはそれを達成するために、セルファクトリを使用する必要があります。

nameBudgetColumn.setCellFactory(tc -> new TextFieldTableCell<>());