Java - network programming

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This is my first attempt at network programming with Java.

In this case, the client and server are the same machine - my MacBook. However in theory it should work the same way when using two different machines.

My short-term plan is to get the client to send messages to the server, so that I can write something into the client, and the server can then display this message.

The next goal will be to make this go both ways - where two computers alternate between the role of Client and Server, sending messages to each other.

If you are a Java programmer looking for sample code, scroll down!

Simplified code

Use this to get started with setting up a TCP connection in Java. If you want to learn how to use networking for Java games, I'd suggest looking at UDP instead - it's less reliable and packets aren't necessary kept in the correct order, but it is faster.
Client

// Connect to Socket
Socket sock = new Socket(SERVER_HOST, SERVER_PORT);
// ...
// When you are finished, remember to close the socket!
sock.close();

Server 
// Create the ServerSocket object
ServerSocket sock = new ServerSocket(SERVER_PORT);
// At the moment, we're just looping indefinitely, waiting for connections
while (true)
{
    // Listen for new sockets
    Socket newSock = sock.accept();
    // If a connection is found, deal with it in a separate thread
    // This allows us to continue listening on the current thread
    if (newSock != null)
        new MyThread(newSock).start();
}

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