— Scott McNealy, Sun Microsystems Chairman, President and ceo

return adviceList[random];
}

public static void main(String[] args) {
DailyAdviceServer server = new DailyAdviceServer();
server.go();
}
}
DailyAdviceServer code
This program makes a ServerSocket and waits for client requests. When it gets 
a client request (i.e. client said new Socket() for this application), the server 
makes a new Socket connection to that client. The server makes a PrintWriter 
(using the Socket’s output stream) and sends a message to the client.
remember the imports
daily advice comes from this array
ServerSocket makes this server 
application ‘listen’ for client requests 
on port 4242 on the machine this 
code is running on.
The server goes into a permanent loop, 
waiting for (and servicing) client requests
the accept method blocks (just sits there) until a 
request comes in, and then the method returns a 
Socket (on some anonymous port) for communicating 
with the client
now we use the Socket connection to the client to 
make a PrintWriter and send it (println()) a String 
advice message. Then we close the Socket because 
we’re done with this client. 
writing a 
server
(remember, these Strings 
were word-wrapped by 
the code editor. Never 
hit return in the middle 
of a String!)

---

networking 
and
threads
you are here
4
485
 BULLET POINTS
ß
Client and server applications communicate over a Socket 
connection.
ß
A Socket represents a connection between two applications 
which may (or may not) be running on two different physical 
machines.
ß
A client must know the IP address (or domain name) and 
TCP port number of the server application.
ß
A TCP port is a 16-bit unsigned number assigned to a 
specific server application. TCP port numbers allow different 
clients to connect to the same machine but communicate 
with different applications running on that machine.
ß
The port numbers from 0 through 1023 are reserved for 
‘well-known services’ including HTTP, FTP, SMTP, etc.
ß
A client connects to a server by making a Server socket