[Zosden]

I want to try to make an instant messaging program. I'm having problems with it, and was wondering if someone could help me.

View class:

Code:

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;


public class View extends JFrame implements ActionListener
{
	Client myClient;
	Server myServer;
	private String myMessage;
	private JTextField myMessageTextField;
	private JTextField mySendMessageTextField;
	private JButton myEnterButton;
	private boolean isClient;
	
	public View(boolean isClient)
	{
		this.isClient = isClient;
		if(isClient)
		{
			myClient = new Client(this);
		}
		else
		{
			myServer = new Server(this);
		}
		
		Container contentPane = this.getContentPane();
		this.setTitle("Instant Messaging");
		this.setLayout(new GridLayout(3, 1));
		this.setSize(300, 300);
		this.setLocationRelativeTo(null);
		
		myMessageTextField = new JTextField();
		myMessageTextField.setEditable(false);
		contentPane.add(myMessageTextField);
		
		mySendMessageTextField = new JTextField();
		contentPane.add(mySendMessageTextField);
		
		myEnterButton = new JButton("Send");
		myEnterButton.addActionListener(this);
		contentPane.add(myEnterButton);
		
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.setVisible(true);
	}

	public String getText() 
	{
		return mySendMessageTextField.getText();
	}

	public void setMessage(String fromServer) 
	{
		myMessage += "\n" + fromServer;
		myMessageTextField.setText(myMessage);
	}

	@Override
	public void actionPerformed(ActionEvent e) 
	{
		if(e.getSource().equals(myEnterButton));
		{
			if(isClient)
			{
				myClient.setText(
						this.mySendMessageTextField.getSelectedText());
			}
			else
			{
				myServer.setText(
						this.mySendMessageTextField.getSelectedText());
			}
		}
	}
	
	
}

Client class:

Code:

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


public class Client implements Runnable
{

	Socket myClientSocket;
    PrintWriter out;
    BufferedReader in;
    String fromServer;
    String fromUser;
    View myView;
    Thread myThread;
    
    public Client(View aView)
    {
    	try 
    	{
            myClientSocket = new Socket("JordanS", 4444);
            out = new PrintWriter(myClientSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(myClientSocket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: taranis.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: taranis.");
            System.exit(1);
        }
        
        myView = aView;
        this.start();
    }
    
    public void start() 
	{
		myThread = new Thread(this);
		myThread.start();
	}
	
	public void stop()
	{
		myThread = null;
	}

	public static void main(String[] args) 
	{
		View aView = new View(true);

	}

	@Override
	public void run() 
	{
		while(true)
		{
			try 
			{
				if((fromServer = in.readLine()) != null) 
				{
				    myView.setMessage(fromServer);
				}
				    
				String sendText = this.getText();
				if (sendText != ""); 
				{
					out.println(fromUser);
					fromUser = "";
				}
			} 
			catch (IOException e) 
			{
				this.closeConnection();
			}
		}	
	}
	
	private String getText() 
	{
		return fromUser;
	}
	
	public String setText(String aMessage) 
	{
		return fromUser;
	}

	private void closeConnection()
	{
		try 
		{
			out.close();
			in.close();
			myClientSocket.close();
			System.exit(0);
		}
		catch (IOException e) 
		{
			e.printStackTrace();
		}
	}
}

Server Class:

Code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;


public class Server implements Runnable
{

	ServerSocket myServerSocket;
    PrintWriter out;
    BufferedReader in;
    String fromServer;
    String fromUser;
    View myView;
    Socket clientSocket;
    
    Thread myThread;
    
    public Server(View aView)
    {
    	ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(4444);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 4444.");
            System.exit(1);
        }

        clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }
        
        try {
			out = new PrintWriter(clientSocket.getOutputStream(), true);
			in = new BufferedReader(new InputStreamReader(
					clientSocket.getInputStream()));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
        myView = aView;
        this.start();
    }

	public void start() 
	{
		myThread = new Thread(this);
		myThread.start();
	}
	
	public void stop()
	{
		myThread = null;
	}

	public static void main(String[] args) 
	{
		View aView = new View(false);

	}

	@Override
	public void run() 
	{
		while(true)
		{
			try 
			{
				if((fromServer = in.readLine()) != null) 
				{
				    myView.setMessage(fromServer);
				}
				    
				String sendText = this.getText();
				if (sendText != ""); 
				{
					out.println(fromUser);
					fromUser = "";
				}
			} 
			catch (IOException e) 
			{
				System.exit(0);
			}
			try
			{
				Thread.sleep(0);
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
		}	
	}
	
	private String getText() 
	{
		return fromUser;
	}
	
	public String setText(String aMessage) 
	{
		return fromUser;
	}

	private void closeConnection()
	{
		try 
		{
			out.close();
	        in.close();
	        clientSocket.close();
	        myServerSocket.close();
		}
		catch (IOException e) 
		{
			e.printStackTrace();
		}
	}
}