Simple Socket program in java

 DATA CLIENT:

package soc;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

import javax.swing.JOptionPane;

/**
 * Trivial client for the date server.
 */
public class DateClient {

    /**
     * Runs the client as an application.  First it displays a dialog
     * box asking for the IP address or hostname of a host running
     * the date server, then connects to it and displays the date that
     * it serves.
     */
    public static void main(String[] args) throws IOException {
        String serverAddress = JOptionPane.showInputDialog(
            "Enter IP Address of a machine that is\n" +
            "running the date service on port 9090:");
        Socket s = new Socket(serverAddress, 9090);
        BufferedReader input =
            new BufferedReader(new InputStreamReader(s.getInputStream()));
        String answer = input.readLine();
        JOptionPane.showMessageDialog(null, answer);
        System.exit(0);
    }
}


DATE SERVER

package soc;

import java.io.IOException;

import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Date;

/**
 * A TCP server that runs on port 9090.  When a client connects, it
 * sends the client the current date and time, then closes the
 * connection with that client.  Arguably just about the simplest
 * server you can write.
 */
public class DateServer {

    /**
     * Runs the server.
     */
    public static void main(String[] args) throws IOException {
        ServerSocket listener = new ServerSocket(9090);
        try {
            while (true) {
                Socket socket = listener.accept();
                try {
                    System.out.println("dateserver is started.........");
                    PrintWriter out =
                        new PrintWriter(socket.getOutputStream(), true);
                   out.println(new Date().toString()+"welcome");
     
                } finally {
                    socket.close();
                }
            }
        }
        finally {
            listener.close();
        }
    }
}