JSONObject jsonObject = new JSONObject();

jsonObject.put("name", "zhangsan");

jsonObject.put("age", 11);

JSONArray array = new JSONArray();

array.put(0,"lisi");

array.put(1,"wangwu");

array.put(2,"zhaoliu");

jsonObject.put("friends", array);

System.out.println(jsonObject.toString());

String str = "{\"friends\":[\"lisi\",\"wangwu\",\"zhaoliu\"],\"age\":11,\"name\":\"zhangsan\"}";

JSONTokener tokener = new JSONTokener(str);

JSONObject object = (JSONObject) tokener.nextValue();

System.out.println(object.getString("name"));

System.out.println(object.getInt("age"));

JSONArray arr = object.getJSONArray("friends");

for (int i = 0; i < arr.length(); i++) {

        String friendName = (String) arr.get(i);

        System.out.println(friendName);

}