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