Question

我遇到的问题是我使用带有CellRenderer的JComboBox来显示我的类AddressNode的值。但是，当我从DropDown中选择一个Item时，它会将Object Value插入EditorComponent而不是Rendered Value。我的CellRenderer的代码如下：

public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
    super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    if (value instanceof AddressNode) {
        AddressNode node = (AddressNode) value;
        String displayString = "";

       displayString += node.getStreet() + " " + node.getHouse();
       if (node.getCity() != null)
           displayString += (", " + node.getCity());
       if (node.getPostCode() != null)
           displayString += (" " + node.getPostCode());

        setText(displayString);
    }
    return this;
}

例如，当我从DropDown列表中选择一个Item时，它会将EditorComponent的值设置为：Model.AddressNode@581280a8。而我希望它将值设置为我的CellRenderer显示的相同String。

Answer 1

您可以尝试以下代码吗？ public Component getListCellRendererComponent（JList list，Object value，int index，boolean isSelected，boolean cellHasFocus）{

if (value instanceof AddressNode) {
    AddressNode node = (AddressNode) value;
    String displayString = "";

   displayString += node.getStreet() + " " + node.getHouse();
   if (node.getCity() != null)
       displayString += (", " + node.getCity());
   if (node.getPostCode() != null)
       displayString += (" " + node.getPostCode());

    //setText(displayString);
}

返回super.getListCellRendererComponent（list，displayString，index，isSelected，cellHasFocus）; }

JComboBox使用CellRenderer选择对象项

1 个答案: