我有一个带可编辑单元格的TableView。
One Cell包含一个带有组合框的可编辑单元格。如果我想更改当前值，我会得到一个ClassCast异常。但我找不到任何像String这样的变量。
哪种方法更改实例String？
谢谢！
控制器：
cols.get(1).setCellValueFactory(new PropertyValueFactory<LieferscheinArtikel, Produkt>("produkt"));
Callback<TableColumn, TableCell> cellFactoryProdukt =
new Callback<TableColumn, TableCell>() {
public TableCell call(TableColumn p) {
return new LieferscheinArtikelEditingProdukt();
}
};
cols.get(1).setCellFactory(cellFactoryProdukt);
cols.get(1).setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<LieferscheinArtikel, Produkt>>() {
@Override
public void handle(CellEditEvent<LieferscheinArtikel, Produkt> event) {
// TODO Auto-generated method stub
}
});
TableCell类：
public class LieferscheinArtikelEditingProdukt extends
TableCell<LieferscheinArtikel, Produkt> {
private ComboBox<Produkt> combobox;
private AutoCompleteComboBoxListener<Produkt> auto;
public LieferscheinArtikelEditingProdukt() {
combobox = new ComboBox<Produkt>();
auto = new AutoCompleteComboBoxListener<Produkt>(combobox);
combobox.setItems(ProduktDataObserv.getInstance("normal").getProduktData());
combobox.valueProperty().addListener(new ChangeListener<Produkt>() {
@Override
public void changed(ObservableValue<? extends Produkt> observable,
Produkt oldValue, Produkt newValue) {
System.out.println("change: "+oldValue+" "+newValue);
setItem(newValue);
System.out.println((getItem() instanceof Produkt) +" "+getItem());
}
});
}
@Override
public void startEdit() {
super.startEdit();
if(getItem() != null){
System.out.println((getItem() instanceof Produkt) +" "+getItem());
combobox.getSelectionModel().select(getItem());
}
//setGraphic(textField);
setGraphic(combobox);
setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
//textField.selectAll();
}
@Override
public void cancelEdit() {
//super.cancelEdit();
//System.out.println("exit: "+combobox.getSelectionModel().getSelectedItem());
//setText(getItem());
System.out.println("can: "+getItem() instanceof String);
//setItem(combobox.getSelectionModel().getSelectedItem());
//setText(combobox.getSelectionModel().getSelectedItem().toString());
//setText(getItem().toString());
setGraphic(null);
setContentDisplay(ContentDisplay.TEXT_ONLY);
}
@Override
public void updateItem(Produkt item, boolean empty) {
if(getItem() != null){
System.out.println("upd: "+this.getItem()!=null?getItem().toString():null);
//super.updateItem(item, empty);
System.out.println((getItem() instanceof Produkt) +" "+getItem());
}
if (empty) {
//setText(null);
setGraphic(null);
} else {
if (isEditing()) {
if (combobox != null) {
combobox.getSelectionModel().select(item);
}
setGraphic(combobox);
setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
} else {
setItem(item);
//setText(getItem() != null ? getItem().toString() : null);
setContentDisplay(ContentDisplay.TEXT_ONLY);
}
}
setItem(item);
//setText(getItem() != null ? getItem().toString() : null);
}
错误消息：
Exception in thread "JavaFX Application Thread" java.lang.ClassCastException: java.lang.String cannot be cast to Produkte.Produkt
at LieferscheinArtikelBearbeiten.LieferscheinArtikelEditingProdukt$1.changed(LieferscheinArtikelEditingProdukt.java:1)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:347)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145)
at javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:167)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.setTextFromTextFieldIntoComboBoxValue(ComboBoxListViewSkin.java:512)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.access$200(ComboBoxListViewSkin.java:57)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin$6.changed(ComboBoxListViewSkin.java:416)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin$6.changed(ComboBoxListViewSkin.java:406)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:347)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.beans.property.ReadOnlyBooleanPropertyBase.fireValueChangedEvent(ReadOnlyBooleanPropertyBase.java:72)
at javafx.scene.Node$FocusedProperty.notifyListeners(Node.java:7486)
at javafx.scene.Node.setFocused(Node.java:7537)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin$FakeFocusTextField.setFakeFocus(ComboBoxListViewSkin.java:697)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin$2.changed(ComboBoxListViewSkin.java:145)
at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin$2.changed(ComboBoxListViewSkin.java:141)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:347)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.beans.property.ReadOnlyBooleanPropertyBase.fireValueChangedEvent(ReadOnlyBooleanPropertyBase.java:72)
at javafx.scene.Node$FocusedProperty.notifyListeners(Node.java:7486)
at javafx.scene.Scene$15.invalidated(Scene.java:2073)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145)
at javafx.scene.Scene$KeyHandler.setFocusOwner(Scene.java:3910)
at javafx.scene.Scene$KeyHandler.requestFocus(Scene.java:3956)
at javafx.scene.Scene$KeyHandler.access$2200(Scene.java:3896)
at javafx.scene.Scene.requestFocus(Scene.java:2040)
at javafx.scene.Node.requestFocus(Node.java:7647)
at com.sun.javafx.scene.control.behavior.TableViewBehaviorBase.mousePressed(TableViewBehaviorBase.java:430)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:95)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:204)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3746)
at javafx.scene.Scene$MouseHandler.access$1800(Scene.java:3471)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1695)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2486)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:314)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:243)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:345)
at com.sun.glass.ui.View.handleMouseEvent(View.java:526)
at com.sun.glass.ui.View.notifyMouse(View.java:898)
LieferscheinArtikel：
公共课LieferscheinArtikel {
private IntegerProperty position;
private FloatProperty menge;
private ObjectProperty<Produkt> produkt = new SimpleObjectProperty<Produkt>(this,"produkt");
private FloatProperty preis;
private StringProperty notiz;
private FloatProperty retour;
public LieferscheinArtikel() {
produkt.set(ProduktDataObserv.getInstance("normal").getProdukt(1));
preis = new SimpleFloatProperty(produkt.get().getPreis());
retour = new SimpleFloatProperty(0);
}
public LieferscheinArtikel(int produktnr) {
produkt.set(ProduktDataObserv.getInstance("normal").getProdukt(produktnr));
preis = new SimpleFloatProperty(produkt.get().getPreis());
retour = new SimpleFloatProperty(0);
}
public LieferscheinArtikel(int position, float menge, float retour,
int produktnr, String produktart, float preis, String notiz) {
this.position = new SimpleIntegerProperty(position);
this.menge = new SimpleFloatProperty(menge);
produkt.set(ProduktDataObserv.getInstance(
produktart.startsWith("KNr") ? produktart : "normal")
.getProdukt(produktnr));
this.preis = new SimpleFloatProperty(preis);
this.notiz = new SimpleStringProperty(notiz);
this.retour = new SimpleFloatProperty(retour);
}
public float getMenge() {
return menge.get();
}
public void setMenge(float menge) {
this.menge.set(menge);
}
public float getPreis() {
return preis.get();
}
public void setPreis(float preis) {
this.preis.set(preis);
;
}
public Produkt getProdukt() {
return produkt.get();
}
public void setProdukt(Produkt produkt) {
System.out.println("setin");
this.produkt.set(produkt);
}
public String getNotiz() {
return notiz == null ? "" : notiz.get();
}
public void setNotiz(String notiz) {
this.notiz.set(notiz);
}
public int getPosition() {
return position == null ? 1 : position.get();
}
public void setPosition(int position) {
this.position.set(position);
}
public float getRetour() {
return retour.get();
}
public void setRetour(float retour) {
this.retour.set(retour);
}
public String getPreisanz() {
return String.format("%.2f \u20ac", preis.get());
}
public ObjectProperty<Produkt> produktProperty(){
return produkt;
}
public String getRetouranz() {
System.out.println(retour + " "+produkt.get().isIsRetourMoeglich());
if (!produkt.get().isIsRetourMoeglich())
return "XXXX";
else
if (retour == null)
return "";
else
return String.format("%.2f", retour.get());
}
@Override
public int hashCode() {
int hash = 7;
return hash;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final LieferscheinArtikel other = (LieferscheinArtikel) obj;
if (this.menge != null && other != null)
try {
if (Float.floatToIntBits(this.menge.get()) != Float
.floatToIntBits(other.menge.get())) {
return false;
}
} catch (NullPointerException ex) {
}
if (this.produkt != null)
if (!Objects.equals(this.produkt, other.produkt)) {
return false;
}
if (this.preis != null)
if (Float.floatToIntBits(this.preis.get()) != Float
.floatToIntBits(other.preis.get())) {
return false;
}
if (this.notiz != null)
if (!Objects.equals(this.notiz, other.notiz)) {
return false;
}
return true;
}
}
PRODUKT：
public class Produkt {
private IntegerProperty produktid;
private StringProperty bezeichnung;
private StringProperty mengeneinheit;
private FloatProperty preis;
private IntegerProperty mwst;
private StringProperty art_der_ware;
private BooleanProperty isRetourMoeglich;
public Produkt(int produktid, String bezeichnung, String mengeneinheit, float preis, int mwst, String art_der_ware, boolean isRetourMoeglich) {
this.produktid = new SimpleIntegerProperty(produktid);
this.bezeichnung = new SimpleStringProperty(bezeichnung);
this.mengeneinheit = new SimpleStringProperty(mengeneinheit);
this.preis = new SimpleFloatProperty(preis);
this.mwst = new SimpleIntegerProperty(mwst);
this.art_der_ware = new SimpleStringProperty(art_der_ware);
this.isRetourMoeglich = new SimpleBooleanProperty(isRetourMoeglich);
}
public Produkt(int produktid, String bezeichnung, String mengeneinheit, float preis, int mwst, String art_der_ware) {
this.produktid = new SimpleIntegerProperty(produktid);
this.bezeichnung = new SimpleStringProperty(bezeichnung);
this.mengeneinheit = new SimpleStringProperty(mengeneinheit);
this.preis = new SimpleFloatProperty(preis);
this.mwst = new SimpleIntegerProperty(mwst);
this.art_der_ware = new SimpleStringProperty(art_der_ware);
this.isRetourMoeglich =new SimpleBooleanProperty(false);
}
public Produkt(){
this.produktid = new SimpleIntegerProperty(0);
this.bezeichnung =new SimpleStringProperty("");
this.mengeneinheit = new SimpleStringProperty("");
this.preis = new SimpleFloatProperty(0.0f);
this.mwst = new SimpleIntegerProperty(0);
this.art_der_ware = new SimpleStringProperty("");
this.isRetourMoeglich =new SimpleBooleanProperty(false);
}
public Produkt(int produktNr){
this.produktid = new SimpleIntegerProperty(produktNr);
}
public int getProduktid() {
return produktid.get();
}
public void setProduktid(int produktid) {
this.produktid.set(produktid);
}
public String getBezeichnung() {
return bezeichnung.get();
}
public void setBezeichnung(String bezeichnung) {
this.bezeichnung.set(bezeichnung);
}
public String getMengeneinheit() {
return mengeneinheit.get();
}
public void setMengeneinheit(String mengeneinheit) {
this.mengeneinheit.set(mengeneinheit);
}
public float getPreis() {
return preis.get();
}
public void setPreis(float preis) {
this.preis.set(preis);
}
public int getMwst() {
return mwst.get();
}
public void setMwst(int mwst) {
this.mwst.set(mwst);
}
public String getArt_der_ware() {
return art_der_ware.get();
}
public void setArt_der_ware(String art_der_ware) {
this.art_der_ware.set(art_der_ware);
}
public boolean isSomethingEmpty() {
return (!art_der_ware.get().isEmpty()
&& !bezeichnung.get().isEmpty()
&& !mengeneinheit.get().isEmpty()
&& (mwst.get() != 0)
&& (preis.get() != 0)
&& produktid.get() != 0);
}
public boolean isIsRetourMoeglich() {
return isRetourMoeglich.get();
}
public void setIsRetourMoeglich(boolean isRetourMoeglich) {
this.isRetourMoeglich.set(isRetourMoeglich);
}
@Override
public String toString() {
return bezeichnung.get();
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if(obj instanceof Produkt){
final Produkt other = (Produkt) obj;
/*if (this.produktid == other.produktid
&& this.art_der_ware.equals(other.art_der_ware)
&& this.bezeichnung.equals(other.bezeichnung)
&& this.mengeneinheit.equals(other.mengeneinheit)
&& this.mwst.get() == other.getMwst()
&& this.preis.get() == other.getPreis()
&& this.isRetourMoeglich.get() == other.isIsRetourMoeglich()) {
return true;
}*/
if (this.produktid.get() == other.getProduktid()) {
return true;
}
}else if (obj instanceof String){
if(((String)obj).equals(this.getBezeichnung()))
return true;
}
return false;
}
}
答案 0 :(得分：0)
在此语句中，您尝试将String对象分配给Produkt对象。
cols.get(1).setCellValueFactory(new PropertyValueFactory<LieferscheinArtikel, Produkt>("produkt"));
为PropertyValueFactory（）构造函数使用Produkt对象。