ClassCastException 从组合框中插入数据到数据库中
ClassCastException to insert data from combobox in database
我正在尝试插入两个字段（JCombobox 中的优先级和根据组合中选择的选项获得的 ID）并完成其余字段（所有字符串）提交所有...但我得到这个 Stacktrace:
run:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: br.com.jdbc.victor.model.PriorityDetail cannot be cast to java.lang.String
at br.com.jdbc.victor.view.FormNewCall.btSubmitActionPerformed(FormNewCall.java:349)
at br.com.jdbc.victor.view.FormNewCall.access0(FormNewCall.java:30)
at br.com.jdbc.victor.view.FormNewCall.actionPerformed(FormNewCall.java:151)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access0(EventQueue.java:97)
at java.awt.EventQueue.run(EventQueue.java:709)
at java.awt.EventQueue.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue.run(EventQueue.java:731)
at java.awt.EventQueue.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109)
at java.awt.WaitDispatchSupport.run(WaitDispatchSupport.java:184)
at java.awt.WaitDispatchSupport.run(WaitDispatchSupport.java:229)
at java.awt.WaitDispatchSupport.run(WaitDispatchSupport.java:227)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227)
at java.awt.Dialog.show(Dialog.java:1084)
at java.awt.Component.show(Component.java:1671)
at java.awt.Component.setVisible(Component.java:1623)
at java.awt.Window.setVisible(Window.java:1014)
at java.awt.Dialog.setVisible(Dialog.java:1005)
at br.com.jdbc.victor.view.FormNewCall.lambda$main[=10=](FormNewCall.java:495)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access0(EventQueue.java:97)
at java.awt.EventQueue.run(EventQueue.java:709)
at java.awt.EventQueue.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
在这两行下：
private void btSubmitActionPerformed(java.awt.event.ActionEvent evt) {
try {
Call call = new Call();
MySQLDaoManager man = new MySQLDaoManager("root", "", "localhost", "attendances", 3306);
java.util.Date date_util = new java.util.Date();
java.sql.Date date_sql = new java.sql.Date(date_util.getDate());
java.sql.Time time_sql = new java.sql.Time(date_util.getTime());
try {
//ClassCastException at this line above
call.setPriority((String) cbPriorityDetail.getSelectedItem());
//this one is giving SQL Error and it's flagged by the Catch block of the code
call.setPriorityDetail(Long.parseLong(tfIdPriorityDetail.getText()));
call.setInitialDate(date_sql);
call.setInitialTime(time_sql);
call.setFinalTime(time_sql);
man.getCallDAO().insert(call);
if(tfCallId.getText().length() != 0){
call.setCallId(Long.parseLong(tfCallId.getText()));
man.getCallDAO().update(call);
}
if(tfInitialDate.getValue() != null && tfInitialTime.getValue() != null && tfFinalTime.getValue() != null){
JOptionPane.showMessageDialog(rootPane, "Inserted User sucessful!!", "Done", JOptionPane.INFORMATION_MESSAGE);
btNewActionPerformed(evt);
} else {
JOptionPane.showMessageDialog(rootPane, "Please fill the fields again", "Isn't possible to insert data", JOptionPane.INFORMATION_MESSAGE);
btNewActionPerformed(evt);
}
} catch (DAOException ex) {
JOptionPane.showMessageDialog(rootPane, "MySQL Error", "Error", JOptionPane.ERROR_MESSAGE);
}
} catch (SQLException ex) {
JOptionPane.showMessageDialog(rootPane, "Error to get connection", "Error", JOptionPane.ERROR_MESSAGE);
}
}
这个表格是这样工作的：你在JComboBoxcbPriorityDetail高、中、低之间选择一项，tfIdPriorityDetail根据选择得到对应的id优先级（我已经做了一个函数，它工作正常）并填写接下来的三个字段：初始日期、初始时间和最终时间...如果我评论这两行有错误并提交其余的它工作正常.
我需要帮助了解我的代码有什么问题？！我无法在调用 table 处插入选定的组合项和生成的 ID，我总是遇到这些错误，非常感谢！
您的组合框似乎管理 'PriorityDetail' 个对象，而不是字符串。您应该将所选对象转换为 'PriorityDetail'，然后从中获取您需要的数据。
PriorityDetail pd = (PriorityDetail) cbPriorityDetail.getSelectedItem();
call.setPriority(pd.getTheStringThatYouNeedFromYourModel());
希望对您有所帮助。
我正在尝试插入两个字段（JCombobox 中的优先级和根据组合中选择的选项获得的 ID）并完成其余字段（所有字符串）提交所有...但我得到这个 Stacktrace:
run:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: br.com.jdbc.victor.model.PriorityDetail cannot be cast to java.lang.String
at br.com.jdbc.victor.view.FormNewCall.btSubmitActionPerformed(FormNewCall.java:349)
at br.com.jdbc.victor.view.FormNewCall.access0(FormNewCall.java:30)
at br.com.jdbc.victor.view.FormNewCall.actionPerformed(FormNewCall.java:151)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access0(EventQueue.java:97)
at java.awt.EventQueue.run(EventQueue.java:709)
at java.awt.EventQueue.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue.run(EventQueue.java:731)
at java.awt.EventQueue.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109)
at java.awt.WaitDispatchSupport.run(WaitDispatchSupport.java:184)
at java.awt.WaitDispatchSupport.run(WaitDispatchSupport.java:229)
at java.awt.WaitDispatchSupport.run(WaitDispatchSupport.java:227)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227)
at java.awt.Dialog.show(Dialog.java:1084)
at java.awt.Component.show(Component.java:1671)
at java.awt.Component.setVisible(Component.java:1623)
at java.awt.Window.setVisible(Window.java:1014)
at java.awt.Dialog.setVisible(Dialog.java:1005)
at br.com.jdbc.victor.view.FormNewCall.lambda$main[=10=](FormNewCall.java:495)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access0(EventQueue.java:97)
at java.awt.EventQueue.run(EventQueue.java:709)
at java.awt.EventQueue.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
在这两行下：
private void btSubmitActionPerformed(java.awt.event.ActionEvent evt) {
try {
Call call = new Call();
MySQLDaoManager man = new MySQLDaoManager("root", "", "localhost", "attendances", 3306);
java.util.Date date_util = new java.util.Date();
java.sql.Date date_sql = new java.sql.Date(date_util.getDate());
java.sql.Time time_sql = new java.sql.Time(date_util.getTime());
try {
//ClassCastException at this line above
call.setPriority((String) cbPriorityDetail.getSelectedItem());
//this one is giving SQL Error and it's flagged by the Catch block of the code
call.setPriorityDetail(Long.parseLong(tfIdPriorityDetail.getText()));
call.setInitialDate(date_sql);
call.setInitialTime(time_sql);
call.setFinalTime(time_sql);
man.getCallDAO().insert(call);
if(tfCallId.getText().length() != 0){
call.setCallId(Long.parseLong(tfCallId.getText()));
man.getCallDAO().update(call);
}
if(tfInitialDate.getValue() != null && tfInitialTime.getValue() != null && tfFinalTime.getValue() != null){
JOptionPane.showMessageDialog(rootPane, "Inserted User sucessful!!", "Done", JOptionPane.INFORMATION_MESSAGE);
btNewActionPerformed(evt);
} else {
JOptionPane.showMessageDialog(rootPane, "Please fill the fields again", "Isn't possible to insert data", JOptionPane.INFORMATION_MESSAGE);
btNewActionPerformed(evt);
}
} catch (DAOException ex) {
JOptionPane.showMessageDialog(rootPane, "MySQL Error", "Error", JOptionPane.ERROR_MESSAGE);
}
} catch (SQLException ex) {
JOptionPane.showMessageDialog(rootPane, "Error to get connection", "Error", JOptionPane.ERROR_MESSAGE);
}
}
这个表格是这样工作的：你在JComboBoxcbPriorityDetail高、中、低之间选择一项，tfIdPriorityDetail根据选择得到对应的id优先级（我已经做了一个函数，它工作正常）并填写接下来的三个字段：初始日期、初始时间和最终时间...如果我评论这两行有错误并提交其余的它工作正常.
我需要帮助了解我的代码有什么问题？！我无法在调用 table 处插入选定的组合项和生成的 ID，我总是遇到这些错误，非常感谢！
您的组合框似乎管理 'PriorityDetail' 个对象，而不是字符串。您应该将所选对象转换为 'PriorityDetail'，然后从中获取您需要的数据。
PriorityDetail pd = (PriorityDetail) cbPriorityDetail.getSelectedItem();
call.setPriority(pd.getTheStringThatYouNeedFromYourModel());
希望对您有所帮助。