java替换string值变更为JSONObject或JSONArray方法

for(inti= 0;i<jsonArray.size();i++) {

              Stringrep=jsonArray.get(i).toString();

              Stringreplace="";

              Stringcity="\"city\":";

              Stringsum="\"detailsum\":";

              Stringreward="";

              replace=rep.replace("[","").replace("]","");

              String[]sp=replace.split(",");

              Stringre1=city+sp[0].toString();

              Stringre2=sum+sp[1].toString();

              reward="{"+re1+","+re2+"}";

              JSONObjectjsonObject= JSONObject.fromObject(reward);

            //JSONArrayjsonarray= JSONArray.fromObject(actinfo);

              jsonArray.set(i,jsonObject);

          }

通过以上方法可以将string取出然后化为单独jsonobject或jsonarray类型