java如何将值添加到列表<Map<String，Object>>？

Question

我正在尝试向ArrayList添加一个值

以下是我编写的代码：

List<Map<String, Object>> list = new ArrayList<>();
list.put(1,"foo", (Object)"bar");

但是，这是行不通的。有人有主意吗

Answer 1

私人列表<；地图<；字符串，对象>&燃气轮机；map_公式

要保存到数据库，请传递此JSON：-

{
"map_formula" : [ 
        {
            "A+" : "if(price<400),\"40000\",0",
            "B" : "",
            "c" : "",
            "d" : "",
            "e" : ""
        }, 
        {
            "poor" : "value for poor",
            "good" : "300",
            "average" : "300",
            "excellent" : "300"
        }
    ]
}

要从数据库中提取：

 for (Map<String, Object> stringObjectMap : obj.getMap_formula()) {

                        if (stringObjectMap.containsKey("key_name"){
                            System.err.println("calculation started");
                        }
                    }

Answer 2

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put("foo", "bar");
list.add(map);