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這是整個類的摘錄,基本上我在類中聲明瞭一個JList和一個DefaultListModel,並創建一個包含一些按鈕和一個列表框的JFrame。單擊roomsButton時,listbox將由hotel.displayRoomsAvailable()函數填充一些選項,並且leftButton將設置爲可見和指定的功能。這個列表框正在用函數的返回正確填充,但是,當我點擊leftButton時,list.getSelectedIndex()總是返回-1,我試過使用getSelectedValue(),但它返回null。我做錯了什麼,不能識別列表中選擇的適當值。這裏只有2列表中的值,所以我不認爲這有什麼關係具有ScrollPane或可見等Java JList.getSelectedIndex()總是返回-1
private JList<String> list;
private static DefaultListModel listModel;
listModel = new DefaultListModel();
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.setLayout(new BorderLayout());
JPanel cusPanel = new JPanel();
list = new JList(listModel);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setPreferredSize(new Dimension(400, 200));
cusPanel.add(list);
frame.add(cusPanel, BorderLayout.CENTER);
JButton roomsButton = new JButton("Display Rooms");
roomsButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
listModel.clear();
String startd = start.getText();
String endd = end.getText();
LocalDate startdate = LocalDate.parse(startd, DateTimeFormat.forPattern("MM/dd/yyyy"));
LocalDate enddate = LocalDate.parse(endd, DateTimeFormat.forPattern("MM/dd/yyyy"));
hotel.displayRoomsAvailable(startdate,enddate);
list = new JList(listModel);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setPreferredSize(new Dimension(400, 200));
leftButton.setText("Reserve Room");
leftButton.setVisible(true);
leftButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
System.out.println(list.getSelectedIndex());
//hotel.bookRoom(true, ID, list.getSelectedValue(), startdate, enddate);
}
});
}
});
我以爲列表對象的工作方式不同,哈哈。我認爲它只是根據創建時listModel中的內容創建了列表,並且除非重新創建對象,否則它不會更改。謝謝。完整的修復 – user3027875 2015-04-04 07:04:50