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修改下面的 UDP 客户端程序，以便在允许输入姓氏和名字后，它会创建一个线程来构建消息，发送到服务器并等待回复。

public static void main(String[] args) {
DatagramSocket aSocket = null;
try { 
Scanner input=new Scanner(System.in);
aSocket = new DatagramSocket(); // any port
System.out.println("Input Surname");
String Surname=input.nextLine();
System.out.println("Input First Name");
String Fname=input.nextLine();
String message=Surname + "," + Fname;
byte [] m = message.getBytes();
InetAddress aHost = InetAddress.getByName("localhost");
int serverPort = 6789;
DatagramPacket request = new DatagramPacket(m, message.length(), aHost,
serverPort);
aSocket.send(request);
aSocket.close();
}catch (SocketException e){System.out.println("Socket: " + e.getMessage());
}catch (IOException e){System.out.println("IO: " + e.getMessage());}
}

在我的一堂课中，我把上面的问题作为练习，我做了如下：

public static void main(String[] args) {
  Runnable r2 = new Runnable() {
    public void run() {
      try {
        DatagramSocket aSocket = new DatagramSocket();
        String myMessage = "Hello World this is me";
        byte[] b = myMessage.getBytes();
        InetAddress host = InetAddress.getByName("localhost");
        int port = 6789;
        DatagramPacket request = new DatagramPacket(b, b.length, host, port);
        aSocket.send(request);
        byte[] buffer = new byte[1000];
        DatagramPacket reply = new DatagramPacket(buffer, buffer.length);
        aSocket.receive(reply);
        System.out.println("received: " + new String(reply.getData()));
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  };
  Thread t2 = new Thread(r2);
  t2.start();
}

我做得对还是应该以任何方式完成？我的意思是有没有更好的方法来做到这一点？提前致谢。

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