java将json格式的字符串转化为对象数组

import com.alibaba.fastjson.JSONArray;

import com.alibaba.fastjson.JSONObject;

//拿到需要转化的json字符串
String jsonString="[{"input4":"40","input3":"30","input2":"20","input1":"10"}]";
JSONArray jsonArray=JSONArray.parseArray(jsonString);
for(int i=0;i<jsonArray.size();i++){
    JSONObject object= (JSONObject) jsonArray.get(i);
    System.out.println(object.get("input3"));
}

结果打印：30