The chat must contain the following basic functions: 1. The client: (1) New user registration (2) the user login validation (3) friends to get friends list and display the status (online/not online) (4) Add Users friends (5) to delete the user friends (6) User chat with your friends (you can view chat history) (7) to receive system information. 2. Server: (1) start and stop background server (2) view client login information (client login time/login IP) (3) to all online users to send system messages.

javaTCPUDP\Client.java
..........\Server.java
..........\TClient.java
..........\TClient2.java
..........\TServer.java
..........\TServer2.java
..........\源码\DatagramClient.class
..........\....\DatagramClient.java
..........\....\DatagramServer.class
..........\....\DatagramServer.java
..........\....\TCPClient.class
..........\....\TCPClient.java
..........\....\TCPServer.class
..........\....\TCPServer.java
..........\源码
javaTCPUDP

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