自己在琢磨中：publicclasshttpurl{??publicstaticvoidmain(String[]args)?{???????try{URLurl=newURL("www.sina.com.cn&qu...

自己在琢磨中：public class httpurl {??public static void main(String[] args)? {??? ????try { URL url = new URL("www.sina.com.cn");??? ???? HttpURLConnection httpurlconnection = (HttpURLConnection)url.openConnection();?? ?? //URLConnection?? urlconnection =url.openConnection(); ??? ??? httpurlconnection.setConnectTimeout(30000);? // 連接主機超時??? httpurlconnection.setReadTimeout(30000);//從主機讀取數據超時??? ???? ??System.out.println(httpurlconnection.getContent());??System.out.println(httpurlconnection.getContentType());??System.out.println(httpurlconnection.getDate());??System.out.println(httpurlconnection.getDoInput());??System.out.println(httpurlconnection.getDoOutput());??System.out.println(httpurlconnection.getContentEncoding() );??System.out.println(httpurlconnection.getPermission() );??System.out.println(httpurlconnection.toString()? );????????? } catch (IOException e) {?????? e.printStackTrace();??????? } }}錯誤出現java.net.MalformedURLException: no protocol: www.sina.com.cn?at java.net.URL.(Unknown Source)?at java.net.URL.(Unknown Source)?at java.net.URL.(Unknown Source)?at httpurl.main(httpurl.java:18)這是什么意思啊，網上也查不到

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