根据标签对 f:selectItems 列表进行排序

我有一个包含值和标签的 selectItem 列表。数据是从数据库中获取的，selectItem 列表具有以下值：

<1,100-500>
<2,1000-1500>
<3,500-1000>

这里 1、2、3 是 selectItem 列表的值，'100-500'、'1000-1500' 和 '500-1000' 分别是标签。如您所见，列表已根据标签排序。但我的要求是列表应显示在下拉列表中，如下所示：

100-500
500-1000
1000-1500

有人可以提出解决方案吗？

如果您无法修改从数据库获取 SelectItem 实例的代码以便按您想要的方式排序，那么您必须自己对它们进行排序：

// this gets you a list which is not sorted as you would like
List<SelectItem> list = getMasterValues("Staff Range");

// you need to sort the list before displaying it. 
// To sort the list, you need a Comparator which will tell the sorting
// algorithm how to order the items
Comparator<SelectItem> comparator = new Comparator<SelectItem>() {
    @Override
    public int compare(SelectItem s1, SelectItem s2) {
        // the items must be compared based on their value (assuming String or Integer value here)
        return s1.getValue().compareTo(s2.getValue());
    }
};

// now that you have the comparator, sort the list using it :
Collections.sort(list, comparator);

// and now iterate over the list to display it :
for (SelectItem item : list) {
    System.out.println("value = " + item.getValue() + "; label = " + item.getLabel());
}