java - 无法迭代列表

Question

我要附加到一个列表，然后将该列表放入下面的函数中:

 List<ItemBean> itemList;

        for (Object bean : beans)
        {
            if (!bean.getItem().isActive())
            {
                itemList.add(bean.getItem().getId());
            }
       }

       if (!itemList.isEmpty())
       {
        // Source of Supply List
        buildItemList( request, commonDAO, false );
       }
       else{
           buildItemFilterList( request, commonDAO, itemList);

       }

但我在这里收到“只能迭代数组或 java.lang.Iterable 实例”错误:

 protected final List<ItemBean> buildItemFilterList( HttpServletRequest request,
                                                             CommonDAO dao,
                                                             ItemBean list
                                                            )
    throws Exception
{
    List<ItemBean> itemList = dao.getAllItems( false );
    ItemBean item;

    for (ItemBean s: list )  <<<<<-----ERROR!!!!!!!!!!!
    {
        item = dao.getItemById(s.getId());
        itemList.add(item);
    }

    Collections.sort( itemList );
    request.setAttribute("itemList", itemList);
    return itemList;
}

Answer 1

错误是，您的参数“SourceOfSupplyBean list”不是集合。

protected final List<ItemBean> buildItemFilterList( 
     HttpServletRequest request,
     CommonDAO dao,
     List<ItemBean> list
)