Client程序同样分别创建一个TCP socket 和一个UDP socket，首先client使用TCP socket连接TCP Server。

连接成功后显示提示信息；

然后client端向TCP Server发送“GET UDP PORT”字符串，Server收到后向client回送自己的UDP Server 端口号（即Client端仅知道TCP Server的端口号而不知道UDP Server的端口号）；

client在收到UDP Server的端口号后, 为用户显示3个选项：

1．“Get current time（TCP）”服务器时间

2．“Echo Mode（UDP）”回显6

3．“Exit the program”.

-Client program also creates a TCP socket, respectively, and a UDP socket, the first client to use TCP socket connection TCP Server. After a successful connection displays a prompt message　and then client-side to the TCP Server sends " GET UDP PORT"　string, Server receipt back to the client to send their UDP Server port number (ie, Client-side only to know the TCP Server' s UDP port number do not know Server' s port number)　client received UDP Server port number, in order to the user three options: 1. " Get current time (TCP)"　server time 2. " Echo Mode (UDP)"　echo 63. " Exit the program" .