Low level connections: Datagram sockets: Unicast
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An Internet application with graphical interface which implements an easy paint program (whiteboard). All messages between two programs are sent by UDP. What an user paints appears on other program's whiteboard.

Download following class files and make a jar file. Then run the jar file as follow:
java -jar Draw.jar <my port> <remote host> <remote port> e.g.:
java -jar Draw.jar 2000 localhost 2001
java -jar Draw.jar 2001 localhost 2000
Draw.class   DrawPanel.class  ReceiverThread.class