ClassCastException從數據庫中的組合框中插入數據

我試圖插入兩個字段（JCombobox中的優先級和根據組合中選擇的選項獲得的ID），並完成其餘字段（全部字符串）提交所有......但我發現這個堆棧跟蹤：在ClassCastException從數據庫中的組合框中插入數據

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.access$500(FormNewCall.java:30) 
    at br.com.jdbc.victor.view.FormNewCall$6.actionPerformed(FormNewCall.java:151) 
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) 
    at javax.swing.AbstractButton$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.access$500(EventQueue.java:97) 
    at java.awt.EventQueue$3.run(EventQueue.java:709) 
    at java.awt.EventQueue$3.run(EventQueue.java:703) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) 
    at java.awt.EventQueue$4.run(EventQueue.java:731) 
    at java.awt.EventQueue$4.run(EventQueue.java:729) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$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$2.run(WaitDispatchSupport.java:184) 
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:229) 
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:227) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227) 
    at java.awt.Dialog.show(Dialog.java:1084) 
    at java.awt.Component.show(Component.java:1671) 
    at java.awt.Component.setVisible(Component.java:1623) 
    at java.awt.Window.setVisible(Window.java:1014) 
    at java.awt.Dialog.setVisible(Dialog.java:1005) 
    at br.com.jdbc.victor.view.FormNewCall.lambda$main$0(FormNewCall.java:495) 
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) 
    at java.awt.EventQueue.access$500(EventQueue.java:97) 
    at java.awt.EventQueue$3.run(EventQueue.java:709) 
    at java.awt.EventQueue$3.run(EventQueue.java:703) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$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)

在這兩條線：

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); 
     } 
    }

這種形式的工作在這樣：你在JComboBox選擇一個項目高，中，低之間d tfIdPriorityDetail根據選定的優先級獲得相應的ID（我已經做了一個功能，它做的很好），並填寫下面三個字段：初始日期，初始時間和最終時間...如果我評論這兩條線這是錯誤的，並提交其餘的工作正常。我需要關於我的代碼有什麼問題的幫助？我無法在Calls表中插入選定的組合項和生成的ID，我總是面臨這些錯誤，非常感謝！

來源

2016-10-04 Victor G.

看來你的組合框管理'PriorityDetail'對象，而不是字符串。您應該將選定的對象轉換爲「PriorityDetail」，然後從中獲取所需的數據。

PriorityDetail pd = (PriorityDetail) cbPriorityDetail.getSelectedItem(); 
call.setPriority(pd.getTheStringThatYouNeedFromYourModel());

希望它有幫助。

來源

2016-10-05 09:28:27 eltabo

嗨eltabo !!!我已經看到了消息，我已經通過試驗和錯誤修復了錯誤，我確實喜歡這樣： chamado.setPrioridade（cbPrioridadeDetalhe.getSelectedItem（）。toString（））;並在我應該投給詮釋它的作品...我想奇怪我不知道投入與放在括號和.toString（）的類型之間的差異;非常感謝您的幫助！！！ –

看看這些解釋：[http://stackoverflow.com/questions/5289393/casting-variables-in-java](http://stackoverflow.com/questions/5289393/casting-variables-in-java） [http://stackoverflow.com/questions/3615721/how-to-use-the-tostring-method-in-java](http://stackoverflow.com/questions/3615721/how-to-use-the-的toString-方法-在-java的） – eltabo

ClassCastException從數據庫中的組合框中插入數據

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