Java 8: How to write lambda stream to work with JsonArray?

Question

I\'m very new to Java 8 lambdas and stuff... I want to write a lambda function that takes a JsonArray, goes over its JsonObjects and creates a list of values of certain fiel

Answer 1

Yes, I recognized that result of put is being added to json array instead of json object. Should be like this.

private static JSONObject getJson(String key, String value){
    JSONObject result = new JSONObject();
    result.put(key, value);
    return result;        
}

public static void main(String[] args) {
    JSONArray jsonArray = new JSONArray();

    jsonArray.add(getJson("name", "John"));
    jsonArray.add(getJson("name", "David"));

    List list = (List) jsonArray.stream()
                .map(json -> json.toString())
                .collect(Collectors.toList());
    System.out.println(list);
}

and output is now [{"name":"John"}, {"name":"David"}] like expected