java循环jsonarray,优化JSonArray for循环

Today, I'm trying to optimize my JSONArray regarding android developer documentation. I was supposed to optimize it but there is error message coming out.

JSONArray infojson = json.getJSONArray("getInfo");

for(int i=0;i < infojson.length();i++){

JSONObject e = infojson.getJSONObject(i);

hm = new HashMap();

hm.put(MYNAME, e.getString("uname"));

hm.put(MYAGE, e.getString("uage"));

}

And I've optimized above coding as follow

JSONArray infojson = jsonObject.getJSONArray("getInfo");

for (Object o : infojson ) {

JSONObject jsonLineItem = (JSONObject) o;

String myname = jsonLineItem.getString("uname");

String myage = jsonLineItem.getString("uage");

}

Unfortunately, I got the following error message occuring on "infojson ) {"

Can only iterate over an array or an instance of java.lang.Iterable

解决方案

You can't use JSONArray with the that syntax as it doesn't implement Iterable interface. As a side note, the micro performance improvement you get probably won't affect your application performance as JSON results that are returned from the WebService are typically not large in size.