修改JSONArray里所有key的值

public JSONArray getNewJSONArray(JSONArray array){
         JSONArray a1=new JSONArray();
         JSONObject aa=new JSONObject();
         for(int i=0;i<array.size();i++){
             JSONObject a= (JSONObject)array.get(i);
             Iterator itt = a.keys();
             Set set=a.keySet();
             List list=new ArrayList(set);
             for(int j=0;j<list.size();j++){
                 aa.put(isAcronym(list.get(j)+""), a.opt(list.get(j)+""));
             }
             a1.add(aa);
            
         }
        return a1;
    }
　　//利用函数将userId-->>user_id
    public String isAcronym(String word) {
        StringBuffer words = new StringBuffer();
        for (int i = 0; i < word.length(); i++) {
            char c = word.charAt(i);
            if (!Character.isLowerCase(c)&&i!=0) {
                        String w=c+"";
                        w="_"+w.toLowerCase();
                        words.append(w);
            }else{
                words.append(c);
            }
        }
        return words.toString();
    }