java循环jsonarray,优化JSonArray for循环

最新推荐文章于 2025-05-11 16:46:29 发布

转载最新推荐文章于 2025-05-11 16:46:29 发布 · 2.1k 阅读

文章标签：

#java循环jsonarray

博客内容讨论了在Android开发中尝试优化JSONArray的迭代过程，但遇到了因JSONArray不实现Iterable接口导致的错误。作者提供了两种编码方式，并指出尽管微观性能有所改善，但由于通常从Web服务返回的JSON数据不大，因此这种优化可能对应用性能影响有限。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

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.