异常：Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.wsb.pub.Item cannot 怎么解决

用netbeans 6.5时，遇到一个问题，没有解决。

DAO.java内的方法：

public List getKhInfos(){
ArrayList lst=new ArrayList();
try{
if(setConnection()){
ResultSet rs=findResultSet("select ID,khname from tb_khinfo order by ID");
while(rs.next()){
Item item=new Item();
item.setID(rs.getString(1).trim());
item.setName(rs.getString(2).trim());
lst.add(item);
}
rs.close();
}
}catch(Exception e){}
return lst;
}

自定义的方法，初始化comboBox列表：

private void initComboID(JComboBox combo){
List khinfo=dao.getKhInfos();
List<Item> items=new ArrayList<Item>();//创建Item列表
combo.removeAllItems();
for(Iterator iter=khinfo.iterator();iter.hasNext();){
List element=(List) iter.next();
Item item=new Item();
item.setID(element.get(0).toString().trim());
item.setName(element.get(1).toString().trim());
//如果Item封闭包含客户信息，跳出循环
if(items.contains(item)){
continue;
}
items.add(item);
combo.addItem(item);
}
}

当程序运行到：List element=(List)iter.next();时出现如下异常：

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.wsb.pub.Item cannot be cast to java.util.List
at com.wsb.khguanli.frmKhguanli.initComboID(frmKhguanli.java:331)
at com.wsb.khguanli.frmKhguanli.<init>(frmKhguanli.java:31)
at com.wsb.JXCFrame.btnKehuGuanliActionPerformed(JXCFrame.java:322)
at com.wsb.JXCFrame.access$000(JXCFrame.java:26)
at com.wsb.JXCFrame$1.actionPerformed(JXCFrame.java:135)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)



这个异常：Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.wsb.pub.Item cannot be cast to java.util.List，不知为什么？

说明一下，List类是引用“java.util.*”内的。