Exit application with button

Question

hi...i need to close the main frame when user key in the correct username and password.when user do a mouse click o key press,the userinput box will show and with correct input the application will exit.my problem now is i need to click the ok button twice then application will exit.why is this so?how can i do to make it work with one click on the button?thanks

Answer 1

oh ya i got two actionlistener...erm...
my codes pretty long because i put everything into a class...sorry...
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class WindowTest
     public static void main(String args[])
          new WindowTestWindow();
//create a black screen
class WindowTestWindow extends JWindow
     WindowTestWindow()
          super();
          // Components should be added to the container's content pane
          Container cp = getContentPane();
          addKeyListener(new KeyAdapter() //for key press
               public void keyTyped(KeyEvent event)
                    char key = event.getKeyChar();
                    if (Character.isLetterOrDigit(key))
                         PasswordBox pw = new PasswordBox(); // show the frame for user to input
                         pw.setVisible(true);                                        //username & password
               public void keyPressed(KeyEvent event){}
               public void keyReleased(KeyEvent event){}
          addMouseListener(new MouseAdapter() //for mouse click
               public void mouseEntered(MouseEvent event){}
               public void mouseExited(MouseEvent event){}
               public void mouseClicked(MouseEvent event)
                    PasswordBox pw = new PasswordBox(); // show the frame for user to input
                    pw.setVisible(true);                                        //username & password
                    //System.exit(0);
               public void mousePressed(MouseEvent event){}
               public void mouseReleased(MouseEvent event){}
          //get screen size
          Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
          // Show the frame according to the user's window size
     int screenHeight = screenSize.height;
     int screenWidth = screenSize.width;
     setSize(screenWidth, screenHeight);
          //set background color black
          cp.setBackground(Color.black);
          // Show the frame
          setVisible(true);
          requestFocus();
//class to exit the whole     application
class CloseActionHandler implements ActionListener
     public void actionPerformed(ActionEvent e)
          WindowTest w = new WindowTest();
          dispose();
          System.exit(0);
//user to input username & password
class PasswordBox extends JFrame
     private JTextField username;
     private JPasswordField password;
     private JButton ok, cancel;
     private JFrame PasswordBox;
     public PasswordBox()
          super("Unlock Screensaver"); //set the frame size
          setSize(280,120);
          JPanel backPanel = new JPanel();
          backPanel.setLayout(new BorderLayout());
          backPanel.setBackground(Color.blue);
          JPanel panel = new JPanel();
          username = new JTextField(5);
          panel.add(new JLabel("Username:", JLabel.RIGHT));
          panel.add(username);
          password = new JPasswordField(5);
          panel.add(new JLabel("Password:", JLabel.RIGHT));
          panel.add(password);
          backPanel.add(panel, BorderLayout.CENTER);
          JPanel OKPanel = new JPanel();
          ok = new JButton("OK");
          //ok.addActionListener(this);
          OKPanel.add(ok, BorderLayout.WEST);
          //add listener to the 'ok' button
          ok.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent e)
               if(e.getSource() == ok)
                    if(username.getText().trim().equals("fyp"))
                         if(password.getText().trim().equals("fyp"))
                              CloseActionHandler cah = new CloseActionHandler();
                              ok.addActionListener(cah);
                         else
                                   clearInputFields();
          JPanel CANCELPanel = new JPanel();
          cancel = new JButton("CANCEL");
          //cancel.addActionListener(this);
          CANCELPanel.add(cancel, BorderLayout.EAST);
          JPanel buttonPanelss = new JPanel();
          buttonPanelss.add(OKPanel);
          buttonPanelss.add(CANCELPanel);
          backPanel.add(buttonPanelss, BorderLayout.SOUTH);
          setContentPane(backPanel);
          // Center the box
     Dimension screenDim =
Toolkit.getDefaultToolkit().getScreenSize();
     Rectangle frameDim = getBounds();
     setLocation((screenDim.width - frameDim.width)
          / 2,(screenDim.height - frameDim.height) / 2);
     public void clearInputFields()
          username.setText("");
          password.setText("");
thanks