How to convert ArrayList to JSON object

Question

public ArrayList<String> convertJsonToJsonObject(){

    ArrayList<String> mylist = new ArrayList<String> ();

    mylist.add("abc");
    mylist.add("cfd");
    mylist.add("ert");
    mylist.add("fg");
    mylist.add("ujk");
    mylist.add("wer");

    mylist.add("dvb");
    mylist.add("ert");


    System.out.println("JSONObject :: "+(JSONObject)JSONSerializer.toJson(mylist));
}

I am having error at .toJson() method, I am not sure what is the mistake I am making.

1. What does the error say ? 2. Which Json library are you using ? — nos
– nos, Commented Jul 7, 2014 at 17:21

rageandqq · Accepted Answer · 2014-07-07 17:21:36Z

23

You can use the GSON library to accomplish this.

 ArrayList<String> mylist = new ArrayList<String> ();
 mylist.add("abc");
 mylist.add("cfd");
 mylist.add("ert");
 mylist.add("fg");
 mylist.add("ujk");
 String json = new Gson().toJson(mylist);

You can refer to the GSON User Guide for more support.

answered Jul 7, 2014 at 17:21

rageandqq

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2 Comments

rageandqq Over a year ago

Be sure to include the GSON library in your project!

newbie Over a year ago

i am trying to convert the array into json object.JSONArray jsArray = new JSONArray(mylist); System.out.println("print the array" + jsArray); for (int i = 0; i < mylist.size(); i++) { jsArray.put(mylist.get(i)); } JSONObject obj = new JSONObject(); System.out.println("print he object" + obj);

SparkOn · Accepted Answer · 2014-07-07 17:30:02Z

9

JSONArray jsArray = new JSONArray(mylist);

Or

Gson gson = new Gson();
String jsonArray = gson.toJson(mylist);

Get java-json.jar and Gson.jar here

edited Jul 7, 2014 at 17:30

answered Jul 7, 2014 at 17:22

SparkOn

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3 Comments

newbie Over a year ago

i got the output in array["acb ", "adg ", "tyy " ].Now i would like to convert the json array to json object.is there any way i can do it?

SparkOn Over a year ago

Hi whatever you are getting it is the json object

SparkOn Over a year ago

Did you understand the concept now may be you were confused because it was not key value pair Read this you will understand it

dikkini · Accepted Answer · 2014-07-07 17:18:49Z

3

gson.toJson(object);

Gson Google Group

answered Jul 7, 2014 at 17:18

dikkini

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3 Comments

newbie Over a year ago

It says,The method toJson(ArrayList<String>) is undefined for the type Object.@Peter Liljenberg

dikkini Over a year ago

List<String> mylist = new ArrayList<> (); myList.add("hello"); System.out.println(new Gson().toJson(mylist));

dikkini Over a year ago

Oh, i understand. I give you link to Google Code of this library, you have to download it and add to dependency of your project.

Shaaban Ebrahim · Accepted Answer · 2017-02-28 11:12:46Z

3

ArrayList<Domain> list = new ArrayList<Domain>();
list.add(new Domain());
list.add(new Domain());
list.add(new Domain());
String json = new Gson().toJson(list);

answered Feb 28, 2017 at 11:12

Shaaban Ebrahim

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2 Comments

Arun Joseph Over a year ago

Can U say how to retrive back the values in list?

Shaaban Ebrahim Over a year ago

@ArunJoshla List<Domain> videos = gson.fromJson(json, new TypeToken<List<Domain>>(){}.getType()); , json is string value that initialized last line of answer

Andriya · Accepted Answer · 2015-07-07 11:27:04Z

2

List<String> bibo = new ArrayList<String>();
bibo.add("obj1");
bibo.add("obj2");
bibo.add("obj3");
String json = new Gson().toJson(bibo);

edited Jul 7, 2015 at 11:27

answered Jul 7, 2015 at 8:39

Andriya

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