HELP!!!!!!! Send and receive between computers

I've made a program to send a line of text from one computer to another, which is the receiver. To do this i have to run the receiver from one computer and on the other computer i run send and then the text appears on the receiver, however i want all this to happen automatically so i just run the program and it does both of the these programs, any ideas on how to do this thanks.

here are the codes for my programs

Code Java:

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/*
	Program: 	ex10receiver
	Date:		August 98
	Version:	1
	Use:		to send a packet to a reciever
*/
 
import java.net.*;	// for network
import java.util.*;	// for utilities
import java.io.*;	// for streams
//import Command;
 
public class Command02
{
 
	public static void main(String[] argv)
	{
		try
		{
			int portNumber 		= 3000;
 
			byte[] buffer = new byte[1024];
 
			// assume that port to send to is in arg vector
			if (argv.length == 1)
			{
				portNumber = Integer.parseInt(argv[0]);
			}
 
			// now create and send packet
			DatagramPacket packet =
				new DatagramPacket(buffer,buffer.length);
 
			DatagramSocket socket = new DatagramSocket(portNumber);
			socket.setSoTimeout(0);
			System.out.println("ready to receive on " +
								socket.getLocalAddress().toString() +
								" port: " + socket.getLocalPort());
 
 
                        socket.receive(packet);
			Command data = new Command(packet.getData());
			System.out.println("Received by " + data.toString());
                        System.out.println(" by ");
		}
		catch (IOException ioe)
		{
			System.out.println("ERROR: " + ioe);
		}
	}
}

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Code Java:

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/*
	Program: 	ex10sender
	Date:		August 98
	Version:	1
	Use:		to send a packet to a reciever
*/
 
import java.net.*;	// for network
import java.util.*;	// for utilities
import java.io.*;	// for streams
//import Command;
 
public class Command03
{
 
	public static void main(String[] argv)
	{
		try
		{
			InetAddress addr 	= InetAddress.getLocalHost();
			//InetAddress addr        = InetAddress.getByName("192.168.0.114");//IP address of recieving computer
                        int sendPortNumber 	= 4000;
			int portNumber		= 3000;
 
			Command data = new Command("Danny Meldrum","N0251665", 4);
 
			byte[] buffer = data.toString().getBytes();
			// assume that machine and port to send to are in arg vector
			if (argv.length == 2)
			{
				try
				{
					addr = InetAddress.getByName(argv[0]);
					portNumber = Integer.parseInt(argv[1]);
				}
				catch (UnknownHostException uh)
				{
					addr = InetAddress.getLocalHost();
				}
			}
 
			// now create and send packet
			DatagramPacket packet =
				new DatagramPacket(buffer,buffer.length,addr,portNumber);
 
			DatagramSocket socket = new DatagramSocket(sendPortNumber);
 
			System.out.println("ready to send on " +
								socket.getLocalAddress().toString() +
								" port: " + socket.getLocalPort());
			socket.send(packet);
 
			System.out.println("Packet data sent");
 
		}
		catch (UnknownHostException uh)
		{
			System.out.println("ERROR: " + uh);
			System.exit(0);
		}
		catch (IOException ioe)
		{
			System.out.println("ERROR: " + ioe);
		}
	}
}

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Code Java:

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/*
	Program: 	ex10command
	Date:		August 98
	Version:	1
*/
 
import java.util.*;
 
class Command implements java.io.Serializable
	{
		public final static String Name 	= "Danny";
		public final static String NTUNumber	= "N0251665";
		public final static String SHOW         = "SHOW";
 
		public String 	type;
		public String	item;
		public int      number;
 
		public Command(String type, String item, int number)
		{
			this.type = type;
			this.item = item;
			this.number = number;
		}
 
		public Command()
		{
			type = null;
			item = null;
			number = 0;
		}
 
		public Command(String data)
		{
			StringTokenizer st = new StringTokenizer(data,",");
			if (st.countTokens() < 3)
			{	// empty data
				type = null;
				item = null;
				number = 0;
			}
			else
			{
				type = st.nextToken().trim();
				item = st.nextToken().trim();
				number = Integer.parseInt(st.nextToken().trim());
			}
		}
 
		public Command (byte[] data)
		{
			this(new String(data));
		}
 
		public String toString()
		{
			String sp = ",";
			return type + sp + item + sp + String.valueOf(number);
		}
 
		public byte[] toByte()
		{
			return toString().getBytes();
		}
 
	}

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