Quelles sont les méthodes de traitement de Json en Java ?

JSONObject jsonObject = JSONObject.fromObject(jsonStr);
Map<String,Object> map = new HashMap<>();
map.put("code",jsonObject .getInt("code"));

JSONObject jsonObject = JSONObject.fromObject(jsonStr);
ArticleForm articleForm = (ArticleForm) JSONObject.toBean(jsonObject , ArticleForm.class);

Map<String, Class> classMap = new HashMap<String, Class>();
classMap.put("keywords", String.class);
ArticleForm articleForm = (ArticleForm) JSONObject.toBean(data.getJSONObject(i), ArticleForm.class,classMap);

List<ArticleForm> list = new ArrayList<>();
JSONArray data = jsonObject.getJSONArray("data");
if (errorCode == 0 && data != null && !data.isEmpty()) {
    for (int i = 0; i < data.size(); i++) {
        Map<String, Class> classMap = new HashMap<String, Class>();
        classMap.put("keywords", String.class);
        ArticleForm articleForm = (ArticleForm) JSONObject.toBean(data.getJSONObject(i), ArticleForm.class,classMap);
        list.add(articleForm);
    }
}

List<ArticleForm> list = new ArrayList<>();
JSONArray data = jsonObject.getJSONArray("data");
if (errorCode == 0 && data != null && !data.isEmpty()) {
    Map<String, Class> classMap = new HashMap<String, Class>();
    classMap.put("keywords", String.class);
    list  = (List<ArticleForm>) JSONArray.toArray(data, ArticleForm.class,classMap);
}

JSONObject jsonObject = JSON.parseObject(jsonStr);
Map<String,Object> map = new HashMap<>();
map.put("code",jsonObject .getInt("code"));

ArticleForm articleForm = JSON.parseObject(jsonStr, new TypeReference<ArticleForm>() {});

List<ArticleForm> list = JSON.parseObject(jsonStr,new TypeReference<ArrayList<ArticleForm>>() {});