json array to list in java code example

Example 1: jsonarray to list java

JSONArray data = new JSONArray(); //create data from this -> [{"thumb_url":"tb-1370913834.jpg","event_id":...}]

List list = data.stream().map(o -> (JSONObject) o).collect(Collectors.toList());

Example 2: json array to List in java

List list = mapper.readValue(jsonString,
TypeFactory.defaultInstance().constructCollectionType(List.class,  
   Employee.class));

Example 3: how to convert a list of json to list of array

dataArray = [{"Value":10,"ValuePourcent":2},{"Value":20,"ValuePourcent":3},{"Value":51,"ValuePourcent":1}]

newFormat = dataArray.map(function(e){
                  return [e["Value"], e["ValuePourcent"]]
                  });

Example 4: convert json to arraylist java

// Top of file
import java.lang.reflect.Type;

// ...

private void parseJSON() {
    Gson gson = new Gson();
    Type type = new TypeToken>(){}.getType();
    List contactList = gson.fromJson(jsonString, type);
    for (ContactModel contact : contactList){
        Log.i("Contact Details", contact.id + "-" + contact.name + "-" + contact.email);
    }
}

Tags:

Related