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[英]How to add Map<String, string> into Map<String, List<Object>> in java
[英]how to add value into List<Map<String, Object>>?
我正在嘗試向ArrayList
添加一個值。
這是我寫的代碼:
List<Map<String, Object>> list = new ArrayList<>();
list.put(1,"foo", (Object)"bar");
但是,這不起作用。 有人有想法嗎?
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);
私人列表<地圖<字符串,對象>> map_formula;
要保存到數據庫,請傳遞此 JSON:-
{
"map_formula" : [
{
"A+" : "if(price<400),\"40000\",0",
"B" : "",
"c" : "",
"d" : "",
"e" : ""
},
{
"poor" : "value for poor",
"good" : "300",
"average" : "300",
"excellent" : "300"
}
]
}
從數據庫中提取:-
for (Map<String, Object> stringObjectMap : obj.getMap_formula()) {
if (stringObjectMap.containsKey("key_name"){
System.err.println("calculation started");
}
}
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