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  • 关于list 添加数据到指定下标

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    protected <T> List<BusinessItemData> itemMap2ItemList(Map<Integer, Map<String, Object>> docBusinessItems,Class<T> item){
            List<BusinessItemData> businessItems = null;
             if (MapUtils.isNotEmpty(docBusinessItems)) {
                businessItems = new ArrayList<BusinessItemData>(docBusinessItems.size());
                for (int orderNo : docBusinessItems.keySet()) {
                    Map<String, Object> docItemAttrs = docBusinessItems.get(orderNo);
                    BusinessItemData tmp = (BusinessItemData) DocumentUtils.backendFill2frontend(item,docItemAttrs);
                    businessItems.add(orderNo-1,tmp);
                }
            }
            return businessItems;
        }

     碰到了诡异的bug ，在本地单元测试 没问题， 但是拿到测试机上就出错，在地8行报数组越界，太诡异了。本地启动tomcat debug一点问题都没有，没办法只能换中方法

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    protected <T> List<BusinessItemData> itemMap2ItemList(Map<Integer, Map<String, Object>> docBusinessItems,Class<T> item){
        BusinessItemData[] businessItems = null;
         if (MapUtils.isNotEmpty(docBusinessItems)) {
            businessItems = new BusinessItemData[docBusinessItems.size()];
            for (int orderNo : docBusinessItems.keySet()) {
                Map<String, Object> docItemAttrs = docBusinessItems.get(orderNo);
                BusinessItemData tmp = (BusinessItemData) DocumentUtils.backendFill2frontend(item,docItemAttrs);
                businessItems[orderNo-1] = tmp;
            }
        }
        return Arrays.asList(businessItems);
    }
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  • 原文地址：https://www.cnblogs.com/juforg/p/3255390.html
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