Fechar a Tela de Login

package PagInicio;

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Arrays;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

/**String Login = tfLogin.getText();  
String Senha = new String(tfSenha.getPassword());  
UsuarioControl uc = new UsuarioControl();  
UsuarioBean usuario = new UsuarioBean();  
usuario.setLogin("");  
usuario.setSenha("");  
JOptionPane.showMessageDialog(null,"LOGIN OU SENHA INCORRETOS!","ERRO", JOptionPane.WARNING_MESSAGE);
 */
public class Login extends JPanel
        implements ActionListener {

    private static String OK = "ok";
    private static String HELP = "help";
    private static String SAIR = "sair";
    private JFrame controllingFrame; //needed for dialogs
    private JPasswordField passwordField;

    public Login(JFrame f) {

        
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, ex);
        }
        controllingFrame = f;

        passwordField = new JPasswordField(10);
        passwordField.setActionCommand(OK);
        passwordField.addActionListener(this);

        JLabel label = new JLabel("Enter the password: ");
        label.setLabelFor(passwordField);

        JComponent buttonPane = createButtonPanel();


        JPanel textPane = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        textPane.add(label);
        textPane.add(passwordField);

        add(textPane);
        add(buttonPane);
    }

    protected JComponent createButtonPanel() {
        JPanel p = new JPanel(new GridLayout(0, 1));
        JButton okButton = new JButton("Acessar");
        JButton helpButton = new JButton("Ajuda");
        JButton sairButton = new JButton("Sair");

        okButton.setActionCommand(OK);
        helpButton.setActionCommand(HELP);
        sairButton.setActionCommand(SAIR);
        okButton.addActionListener(this);
        helpButton.addActionListener(this);
        sairButton.addActionListener(this);

        p.add(okButton);
        p.add(helpButton);
        p.add(sairButton);

        return p;
    }

    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();

        if (OK.equals(cmd)) { //Process the password.
            char[] input = passwordField.getPassword();
            if (isPasswordCorrect(input)) {
                new PagPrincipal().setVisible(true);
                this.disable();
                
               
            } else {
                JOptionPane.showMessageDialog(controllingFrame,
                        "Senha Inválida. Tente Novamente.",
                        "Erro",
                        JOptionPane.ERROR_MESSAGE);
            }
            
            Arrays.fill(input, '0');

            passwordField.selectAll();
            resetFocus();
        } else { //The user has asked for help.

            // System.exit(0);

            JOptionPane.showMessageDialog(controllingFrame,
                    "Caso você não tenha senha.\n"
                    + "Entre em Contato com o Administrador\n"
                    + ""
                    + "    Sistema Desenvolvido por Bruno Cavalcante.");

        }
        
        
        
    }


    private static boolean isPasswordCorrect(char[] input) {
        boolean isCorrect = true;
        char[] correctPassword = {'1', '2', '3', '4', '5', '6'};
        

        if (input.length != correctPassword.length) {
            isCorrect = false;
        } else {
            isCorrect = Arrays.equals(input, correctPassword);
        }

        //Zero out the password.
        Arrays.fill(correctPassword, '0');

        return isCorrect;
    }


    protected void resetFocus() {
        passwordField.requestFocusInWindow();
    }

    
    private static void createAndShowGUI() {
       
        JFrame frame = new JFrame("Login");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        
        final Login newContentPane = new Login(frame);
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

       
        frame.addWindowListener(new WindowAdapter() {

            public void windowActivated(WindowEvent e) {
                newContentPane.resetFocus();
            }
        });

        //Display the window.
        frame.pack();
        frame.setVisible(true);
        
        
        
        
        
        // setclosable(false);
        //setResizable(false);
        //Login.setExtendedState(Frame.MAXIMIZED_BOTH);
    }

    public static void main(String[] args) {
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                //Turn off metal's use of bold fonts
                //UIManager.put("swing.boldMetal", Boolean.FALSE);
                createAndShowGUI();
                UIManager.put("nimbusBase", new Color(152, 135, 105));
                UIManager.put("nimbusBlueGrey", new Color(80, 80, 100));
                UIManager.put("control", new Color(200, 200, 200));
          
                        // setclosable(false);

                
                
            }
        });
    }
    
    

}