错误java.lang.String无法转换为metier.Motif
我使用数据库填充错误java.lang.String无法转换为metier.Motif,java,jcombobox,Java,Jcombobox,我使用数据库填充JComboBoxes和defaultcomboxmodel。现在我想在我的数据库中保存一个注册表。但是我收到了这个错误信息 java.lang.String cannot be cast to metier.Motif 这是我的课堂主题: package metier; public class Motif { private Integer id; private String libelle; private Boolean recetteDepense; En
JComboBox
es和defaultcomboxmodel
。现在我想在我的数据库中保存一个注册表。但是我收到了这个错误信息
java.lang.String cannot be cast to metier.Motif
这是我的课堂主题:
package metier;
public class Motif {
private Integer id;
private String libelle;
private Boolean recetteDepense;
Enregistrement enregistrements[];
public Motif() {
this.id = null;
this.libelle = "";
this.recetteDepense = null;
}
public Motif(Integer id, String libelle, Boolean recetteDepense, Enregistrement[] enregistrements) {
this.id = id;
this.libelle = libelle;
this.recetteDepense = recetteDepense;
this.enregistrements = enregistrements;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLibelle() {
return libelle;
}
public void setLibelle(String libelle) {
this.libelle = libelle;
}
public Boolean getRecetteDepense() {
return recetteDepense;
}
public void setRecetteDepense(Boolean recetteDepense) {
this.recetteDepense = recetteDepense;
}
public Enregistrement[] getEnregistrement() {
return enregistrements;
}
public void setEnregistrement(Enregistrement[] enregistrements) {
this.enregistrements = enregistrements;
}
@Override
public String toString() {
return "Motif{" + "id=" + id + ", libelle=" + libelle + ", recetteDepense=" + recetteDepense + ", enregistrements=" + enregistrements + '}';
}
}
这是我保存注册的功能:
public void enregistrerEnregistrement() throws DaoException {
// Déclarations de variables locales
dao = new DaoH2("gestComptes", "sa", "");
try {
dao.connecter();
Motif motif = (Motif)(((VueAjouterEnregistrement)vue).getModeleJComboBoxMotif().getSelectedItem());
System.out.print(motif.getId());
//dao.ajouterUnEnregistrement(id, idLibelle, idModeReglement, idCompte, idEtat, idMotif, PreLEnc, RecDep, DateEnr, montant, ancienSolde, nouveauSolde, dateFacture, numCHQ, anticipation);
} catch (DaoException ex) {
JOptionPane.showMessageDialog(vue, "CtrlAjouterEnregistrement - instanciation - " + ex.getMessage(), "Enregistrement", JOptionPane.ERROR_MESSAGE);
}
}
我的组合框可以工作,但我不知道如何用对象的getter和setter恢复元素
我得到这个错误:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to metier.Motif
at controleurs.CtrlAjouterEnregistrement.enregistrerEnregistrement(CtrlAjouterEnregistrement.java:235)
at vues.VueAjouterEnregistrement.jButtonValiderActionPerformed(VueAjouterEnregistrement.java:1288)
at vues.VueAjouterEnregistrement.access$000(VueAjouterEnregistrement.java:31)
at vues.VueAjouterEnregistrement$1.actionPerformed(VueAjouterEnregistrement.java:187)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:682)
at java.awt.EventQueue$3.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:696)
at java.awt.EventQueue$4.run(EventQueue.java:694)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)
在这方面:
Motif motif = (Motif)(((VueAjouterEnregistrement)vue).getModeleJComboBoxMotif().getSelectedItem());
您正在尝试强制转换字符串(由((VueaJoueTerenRegistrent)vue)返回)。GetModelEJComboxMotif().getSelectedItem())
)
到主题
这是不可能的
您可以向Motif
添加一个构造函数,该构造函数将字符串作为参数,然后调用该构造函数
编辑
在你的评论中,你问我如何调用你的构造函数。嗯,你应该读一本Java书籍或在线教程,因为调用构造函数并不是什么神奇的事情。这是基本的Java
你可以做:
String motifString = ((VueAjouterEnregistrement)vue).getModeleJComboBoxMotif().getSelectedItem();
Motif motif = new Motif(motifString);
在这一行
Motif motif = (Motif)(((VueAjouterEnregistrement)vue)
.getModeleJComboBoxMotif().getSelectedItem());
您认为getSelectedItem()
返回一个Motif
,实际上它返回一个字符串
您不应该向组合框中添加字符串,而应该添加Motif,并让Motif implementtoString
在GUI中正确表示。然后getSelectedItem
方法将获得所选的Motif。在哪一行,您看到异常了吗?能否提供堆栈跟踪?请显示异常的完整堆栈跟踪!我已经创建了构造函数,但如何在控制器中调用它?Thx和我知道如何调用构造函数,但该字符串为null。但是我的组合框中有数据。如果这是你的问题,你应该把这些信息放到你的问题中…我已经找到了thanx给你!事实上,我在jcombobox中添加了值,而不是对象。谢谢,很抱歉这个愚蠢的错误!