JList与JCheckBox

Question

我尝试做的是JList和复选框。我无法选择多个项目。当我这样做时，已经选中的项将被取消选中。我错过了什么？

JList recipientsList = new JList(
            new RecipientWrapper[] { new RecipientWrapper("apple"), new RecipientWrapper("orange"),
                new RecipientWrapper("mango"), new RecipientWrapper("paw paw"), new RecipientWrapper("banana") });
        recipientsList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        recipientsList.setCellRenderer(new CheckboxListRenderer());

      class CheckboxListRenderer implements ListCellRenderer<RecipientWrapper>
      {
        private static final long serialVersionUID = 1L;
        private JCheckBox checkBox;
        @Override
        public Component getListCellRendererComponent(JList list,RecipientWrapper value, int index, boolean isSelected,
                                                      boolean cellHasFocus)
        {
          Component c = null;
          if(value != null)
          {
            getCheckBox().setText(value.toString());
            checkBox.setSelected(isSelected);
            value.setSelected(isSelected);
            c = checkBox;
          }
          else
          {
            c = new JLabel();
          }
          return c;
        }

        private JCheckBox getCheckBox()
        {
          if(checkBox == null)
          {
            checkBox = new JCheckBox();
          }
          return checkBox;
        }
      }

Answer 1

这就是JList的预期行为。您需要按住、Ctrl、或Shift键来选择列表中的多个值。

如果要更改此行为，可能需要考虑对复选框组件使用ActionListener并跨事件持久化。