当我向下组合一个组合框时，我收到此错误，我使用Javafx库Javoenix
> Exception in thread "JavaFX Application Thread"
> java.lang.IllegalArgumentException: argument type mismatch at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497) at
> sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) at
> sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497) at
> sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) at
> javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769) at
> javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
> at
> com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
> 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.EventUtil.fireEventImpl(EventUtil.java:74)
> at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49) at
> javafx.event.Event.fireEvent(Event.java:198) at
> javafx.scene.Node.fireEvent(Node.java:8411) at
> com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.handleControlPropertyChanged(ComboBoxListViewSkin.java:179)
> at
> com.sun.javafx.scene.control.skin.BehaviorSkinBase.lambda$registerChangeListener$61(BehaviorSkinBase.java:197)
> at
> com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
> at
> javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)
> at
> com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
> at
> com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
> 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:146)
> at javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:150)
> at javafx.scene.control.ComboBox.updateValue(ComboBox.java:463) at
> javafx.scene.control.ComboBox.access$200(ComboBox.java:192) at
> javafx.scene.control.ComboBox$3.changed(ComboBox.java:446) at
> com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
> at
> com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
> at
> javafx.beans.property.ReadOnlyObjectWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyObjectWrapper.java:176)
> at
> javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:142)
> at
> javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
> at
> javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
> at
> javafx.scene.control.SelectionModel.setSelectedItem(SelectionModel.java:102)
> at
> javafx.scene.control.ComboBox$ComboBoxSelectionModel.lambda$new$154(ComboBox.java:494)
> at
> com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137)
> at
> com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
> at
> javafx.beans.property.ReadOnlyIntegerWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:176)
> at
> javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:142)
> at
> javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113)
> at
> javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147)
> at
> javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:68)
> at
> javafx.scene.control.SingleSelectionModel.updateSelectedIndex(SingleSelectionModel.java:215)
> at
> javafx.scene.control.SingleSelectionModel.select(SingleSelectionModel.java:149)
> at
> com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.lambda$createListView$323(ComboBoxListViewSkin.java:484)
> at
> com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349)
> at
> com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
> at
> javafx.beans.property.ReadOnlyIntegerWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:176)
> at
> javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:142)
> at
> javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113)
> at
> javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147)
> at
> javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:68)
> at
> javafx.scene.control.MultipleSelectionModelBase.select(MultipleSelectionModelBase.java:404)
> at
> javafx.scene.control.MultipleSelectionModelBase.clearAndSelect(MultipleSelectionModelBase.java:356)
> at
> javafx.scene.control.ListView$ListViewBitSetSelectionModel.clearAndSelect(ListView.java:1403)
> at
> com.sun.javafx.scene.control.behavior.CellBehaviorBase.simpleSelect(CellBehaviorBase.java:256)
> at
> com.sun.javafx.scene.control.behavior.CellBehaviorBase.doSelect(CellBehaviorBase.java:220)
> at
> com.sun.javafx.scene.control.behavior.CellBehaviorBase.mousePressed(CellBehaviorBase.java:150)
> 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.EventUtil.fireEventImpl(EventUtil.java:74)
> at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at
> javafx.event.Event.fireEvent(Event.java:198) at
> javafx.scene.Scene$MouseHandler.process(Scene.java:3757) at
> javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) at
> javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) at
> javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) at
> com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352)
> at
> com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
> at java.security.AccessController.doPrivileged(Native Method) at
> com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$355(GlassViewEventHandler.java:388)
> at
> com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
> at
> com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
> at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at
> com.sun.glass.ui.View.notifyMouse(View.java:937) at
> com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at
> com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
> at java.lang.Thread.run(Thread.java:745)
这是User类
public class User {
private int id;
private String nom;
private String prenom;
private String cin;
private String tel;
private String adresse;
private String dn;
static final String URL = "jdbc:mysql://localhost:3306/gestionpermission";
static final String Driver ="com.mysql.jdbc.Driver";
public User(String cin, String nom, String prenom, String dn, String tel, String adresse) {
this.nom = nom;
this.prenom = prenom;
this.cin = cin;
this.tel = tel;
this.adresse = adresse;
this.dn = dn;
}
public User() {
}
public int getId() {
return id;
}
public void setNom(String nom) {
this.nom = nom;
}
public void setPrenom(String prenom) {
this.prenom = prenom;
}
public void setCin(String cin) {
this.cin = cin;
}
public void setTel(String tel) {
this.tel = tel;
}
public void setAdresse(String adresse) {
this.adresse = adresse;
}
public void setId(int id) {
this.id = id;
}
public void setDn(String dn) {
this.dn = dn;
}
public String getNom() {
return nom;
}
public String getPrenom() {
return prenom;
}
public String getCin() {
return cin;
}
public String getTel() {
return tel;
}
public String getAdresse() {
return adresse;
}
public String getDn() {
return dn;
}
并在控制器中
User u=new User();
cbo_users.setCellFactory((comboBox) -> {
return new ListCell<User>() {
@Override
protected void updateItem(User item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setText(null);
} else {
setText(item.getNom()+" " +item.getPrenom());
}
}
};
});
cbo_users.setConverter(new StringConverter<User>() {
@Override
public String toString(User u) {
if (u == null) {
return null;
} else {
return u.getNom() + " " + u.getPrenom();
}
}
@Override
public User fromString(String personString) {
return null; // No conversion fromString needed.
}
});
cbo_users.setItems(u.afficher_user());
组合框上的动作事件
void select_user(MouseEvent event) {
User selectuser = cbo_users.getSelectionModel().getSelectedItem();
System.out.println(selectuser.getNom());
// the same result on selectuser.tostring();
}
fxml文件：
<JFXComboBox fx:id="cbo_users" layoutX="543.0" layoutY="35.0" onAction="#select_user" prefHeight="33.0" prefWidth="185.0" />
方法Afficher_user返回一个Observablelist：
public ObservableList afficher_user() throws SQLException{
ObservableList<User> data = FXCollections.observableArrayList();
Connection conn=null;
try {
Class.forName(Driver);
conn = DriverManager.getConnection(URL,"root","");
String sql ="select * from utilisateur";
PreparedStatement Stmt = conn.prepareStatement(sql);
ResultSet rs = Stmt.executeQuery(sql);
while(rs.next()){
User us = new User();
us.setId(rs.getInt("id"));
us.setNom(rs.getString("nom"));
us.setPrenom(rs.getString("prenom"));
us.setCin(rs.getString("cin"));
us.setAdresse(rs.getString("adresse"));
us.setTel(rs.getString("tel"));
us.setDn(rs.getString("dn"));
data.add(us);
}
rs.close();
conn.close();
} catch (ClassNotFoundException ex) {
System.err.println(ex.getMessage());
}
return data;
}
答案 0 :(得分：0)
改变：
void select_user(MouseEvent event) {
User selectuser = cbo_users.getSelectionModel().getSelectedItem();
System.out.println(selectuser.getNom());
}
用这个：
void select_user(ActionEvent event) {
User selectuser = cbo_users.getSelectionModel().getSelectedItem();
System.out.println(selectuser.getNom());
}