Create POJO from json generated by key=>value Array

Question

I want create a pojo from a json like this

{
        "1": [
            {
                "idmapel": 1,
                "label": "Fisika"
            },
            {
                "idmapel": 2,
                "label": "Kimia"
            },
            {
                "idmapel": 3,
                "label": "Biologi"
            },
            {
                "idmapel": 4,
                "label": "Matematika"
            },
        ],
  "2":[
    {
        "idmapel": 1,
        "label": "Fisika"
    }
  ]
}

when i generate from http://www.jsonschema2pojo.org/ it created a 1 and 2 class, but imagine if i have more than 2 keys. i want to be able to access element by something like this ObjectClass::getList(1) or ObjectClass::getList(2)

Could you elaborate? I'm imagining more than 2 keys, but nothing seems to be happening. You say it works - are you worried about scalability or something? If so, what are your concerns? — Vince
– Vince, Commented Sep 30, 2017 at 7:17
i am retrieving this from server with retrofit, the result may contain key 1,2,3, ..,n, depend on data, so what i want is i want to be able get collection by the key, if i wan to get collection with 1 key it should be accessible via ObjectClass::get(key) where key is 1, 2, or whatever the key on this json — Matius Nugroho Aryanto
– Matius Nugroho Aryanto, Commented Oct 1, 2017 at 3:53

Ruben Vardanyan · Accepted Answer · 2017-09-30 07:18:56Z

1

You can use a Map to do this.

Map<String, List<Pojo>> map = deserialize(jsonSring);

where Pojo is the class which has fields idmapel and label, deserialize is a method which deserializes the json to object and jsonString is the json string value to deserialize. Then you can access lists with keys

List<Pojo> list1 = map.get("1");
List<Pojo> list2 = map.get("2");

answered Sep 30, 2017 at 7:18

Ruben Vardanyan

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1 Comment

Matius Nugroho Aryanto Over a year ago

seems like best approach, will try

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