Discussion of Activity 9.6 - Putting the simple client and server together

It is important to ensure that the server is running before you try to run the client. To do this, you need to ensure that you run the project in the server folder first. The server should display a message to indicate that it is starting up, and some further messages when the client connects and when the server closes down.

There is no special significance in using port 3000 - any port number could have been used, although it is normally best to avoid numbers in the range 0-1023 some of which are conventionally used for standard services.

You can experiment with using other port numbers by editing the PORT_NUMBER constant in the class HelloServer. You must, of course, make the corresponding change to the client code in the HelloClient class.