如何将JSONArray分配给变量？

Question

I'm new to Java and I have a problem :

JSONObject data = new JSONObject(json);
List<String> list = (List<String>) data.getJSONArray("childrens");

for (String item : list) {
       Log.d("DEBUG", item);
}

I would like to assign data.getJSONArray("childrens") to a variable list , but I have an error:

java.lang.ClassCastException: org.json.JSONArray cannot be cast to java.util.List

How can I do this?

I would like to iterate over JSON Array.

Answer 1

You can't data.getJSONArray("childrens") returns an object of type org.json.JSONArray .

However, you can iterate over a JSONArray :

    JSONArray jArray = data.getJSONArray("childrens");

    for (int i = 0; i < jArray.length(); i++) {
        JSONObject jb = jArray.getJSONObject(i);
        Log.d("DEBUG", jb);
    }

Answer 2

JSONObject only contains JSONArray , not List . You have to transform it manually:

JSONObject data = new JSONObject(json);
JSONArray jsonArray = data.getJSONArray("childrens");
for (Object o : jsonArray) {
    String child = (String)o;
    Log.d("DEBUG", child);
}