Creating an array with Gson

Question

I am using gson to create JSON objects in Java. I am trying to make an array with three elements:

[ "ONE", "TWO", "THREE" ]

With this code:

    JsonArray   array   = new JsonArray ();
    array.add("ONE");
    array.add("TWO");
    array.add("THREE");

But the add() only accepts a JsonElement object, rather than an actual string.

The reason I'm under the impression I should be able to do this, is because I've used a C# script called SimpleJSON with Unity3D in the past. With it, I could do this:

    JSONArray ary = new JSONArray ();
    ary.Add("ONE");
    ary.Add("TWO");
    ary.Add("THREE");

Which works fine. I'm just not sure how to do this with gson.

I know I can convert a Java array into a JSON object:

String[] strings = {"abc", "def", "ghi"};
gson.toJson(strings);  ==> prints ["abc", "def", "ghi"]

However, I want to dynamically createobjects in a JsonArray (the Add method), like I can with C#.

scrappedcola · Accepted Answer · 2014-10-31 22:08:26Z

4

JsonPrimitive. You should be able to use array.add(new JsonPrimitive(yourString);

answered Oct 31, 2014 at 22:08

scrappedcola

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carlosHT · Accepted Answer · 2014-10-31 22:14:30Z

1

You could do something like:

JsonArray array = new JsonArray();
array.add(new JsonPrimitive("ONE"));
array.add(new JsonPrimitive("TWO"));
array.add(new JsonPrimitive("THREE"));

answered Oct 31, 2014 at 22:14

carlosHT

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cassiomolin · Accepted Answer · 2014-10-31 22:24:15Z

1

There's an alternative to do that with Lists, which are really easy to manipulate.
You can add your Strings to a List and then create a JSON from it:

List<String> list = new ArrayList<String>();
list.add("ONE");
list.add("TWO");
list.add("THREE");

Gson gson = new Gson();
String array = gson.toJson(list);

edited Oct 31, 2014 at 22:24

answered Oct 31, 2014 at 22:05

cassiomolin

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Nickolay Surkov · Accepted Answer · 2014-10-31 22:57:08Z

1

array.add(gson.toJsonTree ("ONE"));

answered Oct 31, 2014 at 22:57

Nickolay Surkov

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