Problems with My Code

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.net.*;

import java.io.*;



public class NeoLogin implements ActionListener {



	private JFrame window = new JFrame("Nets's Neopets Login");

	private JLabel usernameLabel = new JLabel("Username: ");

	private JTextField usernameField = new JTextField("");

	private JLabel passwordLabel = new JLabel("Password: ");

	private JTextField passwordField = new JTextField("");

	private JButton login = new JButton("Login");

	String username;

	String password;



	public NeoLogin() {



    window.setSize(300, 300);

    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    window.setLayout(new GridLayout(5,5));



		window.add(usernameLabel);

		window.add(usernameField);

		window.add(passwordLabel);

		window.add(passwordField);

		window.add(login);



		login.addActionListener(this);



	window.setVisible(true);

}



public void actionPerformed(ActionEvent a) {



	BufferedReader usernameStream;

	BufferedReader passwordStream;

	BufferedReader loginStream;

	String usernameLoginResponse;

	String passwordLoginResponse;

	String loggedInResponse;



		 login.setEnabled(false);



		 username = usernameField.getText();

		 password = passwordField.getText();



		 if (username.equals("")) {



			 JOptionPane.showMessageDialog(null, "You forgot to fill out the username field!");

			 login.setEnabled(true);

		 }



		 if (password.equals("")) {



			 JOptionPane.showMessageDialog(null, "You forgot to fill out the password field!");

			 login.setEnabled(true);

		 }



			 System.out.println("Going to the main site...");



			 try {



	    URL neopetsMain = new URL("http://neopets.com/index.phtml");



		URLConnection neopetsMainConnection = neopetsMain.openConnection();



		     System.out.println("At the main site, waiting 5 seconds...");



		Thread.sleep(5000);



		     System.out.println("Going to the login page...");



	URL neopetsLoginPage = new URL("http://neopets.com/loginpage.phtml");



	URLConnection neopetsLoginConnection = neopetsLoginPage.openConnection();



	         System.out.println("At the login page, waiting 2 and a half seconds...");



	Thread.sleep(2500);



	         System.out.println("Typing in username and going to the password page...");



	URL neopetsUsernameLogin = new URL("http://neopets.com/login.phtml?username="+username);



	usernameStream = new BufferedReader(new InputStreamReader(neopetsUsernameLogin.openStream()));



    while ((usernameLoginResponse = usernameStream.readLine()) != null) {



		    if (usernameLoginResponse.contains("Incorrect username in cookie.")) {



				JOptionPane.showMessageDialog(null, "Username is invalid!");

				login.setEnabled(true);

				usernameStream.close();

				break;

			}

    }



       System.out.println("About to login, waiting 2 and a half seconds...");



      Thread.sleep(2500);



     URL neopetsPasswordLogin = new URL("http://neopets.com/login.phtml?username="+username+"&password="+password);



        passwordStream = new BufferedReader(new InputStreamReader(neopetsPasswordLogin.openStream()));





     while ((passwordLoginResponse = passwordStream.readLine()) != null) {



		 if (passwordLoginResponse.contains("That username/password combination is invalid.")) {



			 JOptionPane.showMessageDialog(null, "Invalid username or password!");

			 login.setEnabled(true);

			 passwordStream.close();

			 break;

		 }

	 }



	 loginStream = new BufferedReader(new InputStreamReader(neopetsMain.openStream()));



	 while ((loggedInResponse = loginStream.readLine()) != null) {



		 if (loggedInResponse.contains("Welcome, "+username)) {



			 JOptionPane.showMessageDialog(null, "Successfully logged in!");

			 login.setEnabled(true);

			 break;

		 }



		 if (loggedInResponse.contains("Login to Neopets!")) {



			 System.out.println("Error with logging in, fix your cookies.");

			 JOptionPane.showMessageDialog(null, "Odd error with logging in! Try fixing your cookies!");

			 login.setEnabled(true);

			 loginStream.close();

			 break;

		 }



	 }



	} catch (InterruptedException e) {



            System.out.println("Waiting was interrupted.");

            System.out.println("InterruptedException:"+e);

            JOptionPane.showMessageDialog(null, "Interrupted when trying to act like a human by waiting a few seconds.");

			login.setEnabled(true);



		} catch (IOException e) {



            System.out.println("Unable to connect.");

	        System.out.println("IOException: "+e);

	        JOptionPane.showMessageDialog(null, "Unable to connect to the designated page on Neopets.");

	        login.setEnabled(true);

		}



	 }



	public static void main(String args[]) {



		System.out.println("Welcome to the Nets's Neopets Login debugger.");



		new NeoLogin();



	}

}