Write the code of a server and a client using the Java networking package. The server

Write the code of a server and a client using the Java networking package. The server is always listening to its port (of your choice). A client connects to the server and sends an integer n to it. The server calculates the sum of numbers from 1 to n and sends the result back to the client. Then it comes back waiting for another client. Note that the server can serve only one client at once.