java - 为什么这个程序不结束？

Question

我期待收到 HTTP 响应，然后关闭 Socket 但它只是坐在那里，在页面返回后永远不会结束。我假设它与 Scanner 有关；为什么这个程序永远不会结束？

public class PingHost {
   public static void main(String[] args) throws Exception {
      Socket s = new Socket("www.google.com", 80);
      DataOutputStream out = new DataOutputStream(s.getOutputStream());
      out.writeBytes("GET / HTTP/1.1\n\n");
      Scanner sc = new Scanner(s.getInputStream());
      while (sc.hasNext())
         System.out.println(sc.nextLine());
      System.out.println("never gets to here");
      s.close();
   }
}

Answer 1

来自javadoc

This method may block while waiting for input to scan