The function of a program or system: design a simple chat program using datagram.

chat
....\PacketReceiveDemo
....\.................\bak
....\.................\...\packetreceivedemo
....\.................\...\.................\Application1.java~1~
....\.................\...\.................\Application1.java~2~
....\.................\classes
....\.................\.......\package cache
....\.................\.......\.............\packetreceivedemo.dep2
....\.................\.......\packetreceivedemo
....\.................\.......\.................\Application1.class
....\.................\.......\.................\Frame1.class
....\.................\PacketReceiveDemo.jpx
....\.................\PacketReceiveDemo.jpx.local
....\.................\PacketReceiveDemo.jpx.local~
....\.................\PacketReceiveDemo.jpx~
....\.................\src
....\.................\...\packetreceivedemo
....\.................\...\.................\Application1.java
....\.................\...\.................\Frame1.java
....\PacketSendDemo
....\..............\bak
....\..............\...\packetsenddemo
....\..............\...\..............\Application1.java~1~
....\..............\classes
....\..............\.......\package cache
....\..............\.......\.............\packetsenddemo.dep2
....\..............\.......\packetsenddemo
....\..............\.......\..............\Application1.class
....\..............\.......\..............\Frame1.class
....\..............\PacketSendDemo.jpx
....\..............\PacketSendDemo.jpx.local
....\..............\PacketSendDemo.jpx.local~
....\..............\PacketSendDemo.jpx~
....\..............\src
....\..............\...\packetsenddemo
....\..............\...\..............\Application1.java
....\..............\...\..............\Frame1.java

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