JSONObject jsonObject = new JSONObject();jsonObject.put("a", "1");jsonObject.put("b", "2");jsonObject.put("c", "3");System.out.println(jsonObject);

{"a":"1","b":"2","c":"3"}

Map<String, String> map = new HashMap<String, String>();map.put("a","1");map.put("b","2");map.put("c","3");System.out.println(JSONObject.fromObject(map));

{"b":"2","c":"3","a":"1"}