Create key-value pairs string in JSON

Question

I\'m new to JSON. I\'m trying to create a JSON string in Java (org.json.JSONObject(json.jar)) which resembles like (basically a set of name-value pairs)

[{
          


        

Answer 1

Try to use gson if you have to work a lot with JSON in java. Gson is a Java library that can be used to convert Java Objects into JSON representation. It can also be used to convert a JSON string to an equivalent Java object.

Here is a small example:

Gson gson = new Gson();
gson.toJson(1);            ==> prints 1
gson.toJson("abcd");       ==> prints "abcd"
gson.toJson(new Long(10)); ==> prints 10
int[] values = { 1 };
gson.toJson(values);       ==> prints [1]

Answer 2

The library is chained, so you can create your object by first creating a json array, then creating the individual objects and adding them one at a time to the array, like so:

new JSONArray()
    .put(new JSONObject()
            .put("name", "cases")
            .put("value", 23))
    .put(new JSONObject()
            .put("name", "revenue")
            .put("value", 34))
    .put(new JSONObject()
            .put("name", "1D5")
            .put("value", 56))
    .put(new JSONObject()
            .put("name", "diag")
            .put("value", 14))
    .toString();

Once you have the final array, call toString on it to get the output.

Answer 3

What you've got there is a JSON array containing 4 JSON objects. Each object contains two keys and two values. In Java a JSON "object" is generally represented by some sort of "Map".