老师如果JsonArray Key是空值 那要怎解析JSON数据?

老师如果JsonArray Key是空值 那要怎解析JSON数据?....比如这种JSON.

[{"account":"jack","date":"20160501","amount":1500,"type":0},{"account":"jack","date":"20160501","amount":6000,"type":0},{"account":"jack","date":"20160502","amount":3000,"type":1},{"account":"jack","date":"20160501","amount":20000,"type":0},{"account":"jack","date":"20160501","amount":1000,"type":1}]

而我的CODE是这样打...不过出不了数据

KmshopResult kmshopResult = new KmshopResult();
JSONObject jsonObject = new JSONObject(result);
List<KmshopResult.Kmpost> kmpostList = new ArrayList<>();
JSONArray kmshops = jsonObject.getJSONArray("null");

if(kmshops!=null && kmshops.length()>0){
   for(int index = 0; index<kmshops.length();index++){
       JSONObject kmshop = (JSONObject) kmshops.get(index);
       String account = kmshop.getString("account");


       KmshopResult.Kmpost kmshopItem = new KmshopResult.Kmpost();
       kmshopItem.setmAccount(account);

       kmpostList.add(kmshopItem);
   }
   kmshopResult.setmKmposts(kmpostList);
}
mTextView.setText(kmshopResult.toString()); 

错误是

2019-03-20 14:57:23.762 5274-5274/com.imooc.demo W/System.err: org.json.JSONException: Value [{"account":"jack","date":"20160501","amount":1500,"type":0},{"account":"jack","date":"20160501","amount":6000,"type":0},{"account":"jack","date":"20160502","amount":3000,"type":1},{"account":"jack","date":"20160501","amount":20000,"type":0},{"account":"jack","date":"20160501","amount":1000,"type":1}] of type org.json.JSONArray cannot be converted to JSONObject

2019-03-20 14:57:23.762 5274-5274/com.imooc.demo W/System.err:     at org.json.JSON.typeMismatch(JSON.java:111)