Untitled

import java.io.*;
import java.net.*;

public class Node {

    public static void main(String[] args) {

        if(args.length == 2) {
		Server s = new Server(Integer.parseInt(args[0]),Integer.parseInt(args[1]));
		s.startListening();
        } else if(args.length == 4) {
            	Client c = new Client(Integer.parseInt(args[0]),args[1],Integer.parseInt(args[2]),args[3]);
		c.connect();
        } else {
            	System.err.println("\nUsage (Server): java Node <port> <clients>");
		System.err.println("Usage (Client): java Node <id> <server> <port> <COMMIT|ABORT>\n");
		System.err.println("Note: Only ports 9000-9060 may be used on DCS machines\n");
            	System.exit(-1);
        }
    }
}

class Server {
	int listenport;
	ServerSocket myserver = null;
	Socket myclient = null;

	Server(int port, int clients){
		listenport = port;
					}

	public void startListening() {

	try {
		myserver = new ServerSocket(listenport);
		} catch (IOException e)   {
			 System.err.println("Could not listen on port " + listenport);
			System.exit(1); }
	try {
		myclient = myserver.accept();
		} catch (IOException e)	{
			System.err.println("accept failed, sorry");
			System.exit(1); }

	}
}


class Client {

	String hostname;
	int serverport;
	Socket clientsocket = null;
	String status = null;
	int id;

	Client(int id, String host, int port, String status) {
	this.id = id;
	this.status = status;
	this.hostname = host;
	}

	public void connect() {

	try {
	clientsocket = new Socket(hostname, serverport);
	} catch (UnknownHostException e) {
		System.err.println("dont know about this host :  " + hostname);
		System.exit(1);
		}
	catch (IOException e) {
		System.err.println("could not get IO for this host " + hostname) ;
		System.exit(1);
			}
	}

}