Parsing JSON Array to Java ArrayList

First Create Bean Class that you need to convert on ArrayList. Right now for sample i have just create country Class as below.

 

public class Country {
    private int countryID;
    private String countryName;


    public Country(int countryID, String countryName) {
        this.countryID = countryID;
        this.countryName = countryName;
    }

    public int getCountryID() {
        return countryID;
    }

    public void setCountryID(int countryID) {
        this.countryID = countryID;
    }

    public String getCountryName() {
        return countryName;
    }

    public void setCountryName(String countryName) {
        this.countryName = countryName;
    }

}

Now lets Create Json String for convert Java ArrayList Object. This string also come from JSON API.

    private String countryJson = "{\"category\": [{\n" +
            "            \"countryID\":\"1\",\n" +
            "            \"countryName\": \"India\",\n" +
            "            {\n" +
            "            \"countryID\": \"2\",\n" +
            "            \"countryName\": \"UK\",\n" +
            "            },\n" +
            "            {\n" +
            "            \"countryID\": \"3\",\n" +
            "            \"countryName\": \"US\",\n" +
            "            \n" +
            "            }\n" +
            "            ]\n" +
            "            }";

         Type listType = new TypeToken>() {}.getType();

        JsonParser jsonParser = new JsonParser();
        JsonObject jo = (JsonObject)jsonParser.parse(countryJson);
        JsonArray jsonArr = jo.getAsJsonArray("category");
        Gson googleJson = new Gson();
        countries = googleJson.fromJson(jsonArr.toString(), listType);

        System.out.println("List Elements are  : "+countries.get(0).getCountryName());

That's it.