client/UdpDemo.java

• contains the application's entry point
• contains the UdpScreen class, which defines the UI
• contains the fieldChangeListener() implementation that sends or clears the message that the user types when the user clicks the Send key or Clear button or clicks the menu item
• contains helper methods to perform the above tasks

client/UdpClient.java

class that defines the thread that creates the connection and Datagram objects, sends the message that the user types to the server-side connection, and receives and displays the string RECEIVED from the server when the message is received

server/UdpServer.java

Java® class that is the server-side application, which receives messages from the client-side application, displays the message, and sends back the string RECEIVED when the server-side application has successfully received the message

server/run.bat

DOS script file that compiles and starts the server-side application