我正在尝试使用Netbeans和我的编程考试的model-control-view模式制作一个桌面应用程序。我必须管理一个床和早餐，但在向存档中添加空间时遇到了问题（我正在使用模拟Dao）（我还将代码翻译成英语以使您更好地理解，所以很抱歉如果我忘记了某些单词或某些单词不正确）
public class ControlDialogAddRoom {
private Action actionAddRoom = new ActionAddRoom();
public Action getActionAddRoom() {
return actionAddRoom;
}
private class ActionAddRoom extends AbstractAction{
public ActionAddRoom (){
this.putValue(Action.NAME, "Add room");
this.putValue(Action.SHORT_DESCRIPTION, "Add a room");
}
@Override
public void actionPerformed(ActionEvent e) {
Bed bed= (Bed)Application.getInstance().getModel().getBean(Constants.BED);
Room roomAdded = checkFields(bed);
if(roomAdded != null){
//i wrote this just to make sure that the program was getting the right text from the fields
System.out.println(roomAdded.toString());
bed.addRoom(roomAdded);
Application.getInstance().getFrame().showInfo("Room correctly added!");
Applicazione.getInstance().getDialogRoomAdded().initFields();
}
}
现在，我将粘贴checkField方法。名称和代码是两个JTextField，价格和numberOfBeds是两个JSpinner。如果我保留默认数字1，则价格的Jspinner字段也会给我一些错误。
private Room checkFields(Bed){
StringBuilder errors = new StringBuilder();
String roomCode = Application.getInstance().getDialogAddRoom().getFieldCode();
String roomName = Application.getInstance().getDialogAddRoom().getFieldName();
float price= (Float)Application.getInstance().getDialogAddRoom().getSpinnerPrice();
int numberOfBeds = (Integer)Application.getInstance().getDialogAddRoom().getSpinnerNumberOfBeds();
if(roomCode.isEmpty()){
errors.append("\nThe code cant be empty");
}
for(Room room : bed.getRooms()){
if(room.getCode().equals(roomCode)){
errors.append("\nThere's already a room with that code");
}
}
if(roomName.isEmpty()){
errors.append("\nThe field name can't be empty");
}
if(!(errors.toString()).isEmpty()){
Application.getInstance().getFrame().showErrors(errors.toString());
return null;
}
return new Room(roomName, roomCode, numberOfBeds, price);
}
价格错误：
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Float
主要错误是在代码行中
bed.addRoom(roomAdded);
在Bed类中，这是一个简单的方法，对我而言，它在很多时候都起作用。我有一个房间列表，我只是添加一个新房间：
private List<Room> rooms = new ArrayList<>();
public void addRoom(Room room){
this.rooms.add(room);
}
我在输出中得到以下堆栈
Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:148)
at java.util.AbstractList.add(AbstractList.java:108)
at it.unibas.bedandbreakfast.model.Bed.addRoom(Sistema.java:27)
at it.unibas.bedandbreakfast.control.ControlDialogAddRoom$ActionAddRoom.actionPerformed(ControlDialogAddRoom.java:51)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$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.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
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:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
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:80)
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$4.run(WaitDispatchSupport.java:227)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227)
at java.awt.Dialog.show(Dialog.java:1084)
at java.awt.Component.show(Component.java:1671)
at java.awt.Component.setVisible(Component.java:1623)
at java.awt.Window.setVisible(Window.java:1014)
at java.awt.Dialog.setVisible(Dialog.java:1005)
at it.unibas.bedandbreakfast.view.DialogAddRoom.showWindow(DialogAddRoom.java:151)
at it.unibas.bedandbreakfast.control.ControlPanelMenu$ActionAddRoom.actionPerformed(ControlPanelMenu.java:65)
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.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
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:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
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:80)
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.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)
我真的不明白怎么了？？？我几乎可以肯定问题出在代码行bed.addRoom(roomAdded);
编辑： 我已经修改了动作中的某些行，现在可以使用了，但是我仍然想知道自己之前做错了什么。我已经添加了
public void actionPerformed(ActionEvent e) {
Bed bed= (Bed)Application.getInstance().getModel().getBean(Constants.BED);
//ADDED THE FOLLOWING LINE
List<Room> allTheRooms = new ArrayList<>(bed.getRooms());
Room roomAdded = checkFields(bed);
if(roomAdded != null){
System.out.println(roomAdded.toString());
//ADDED THE FOLLOWING TWO LINES
allTheRooms.add(addedRoom);
bed.setRooms(allTheRooms);
Application.getInstance().getFrame().showInfo("Room correctly added!");
就像用户@ xerx593在评论中说的那样，就像类型信息丢失了