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Message:
Passing variables in Swing
Posted by KABOOM on January 18, 2002 at 1:10 AM
I've got a bit of a dilemma. I'm just trying to make a basic login but the problem is, I have this "OK" button coded as: okb.addActionListener(this); This goes to a action performed method. Great, nothing abnormal there.
public void actionPerformed(ActionEvent pressbtn)
{
// Do stuff
} The problem is, I want to access the data in the username and password fields but I can't unless I pass them to the actionPerformed method. If I do that, the compiler yells at me.
So, I tried to declare and save them as private variables but nothing gets saved until the user clicks the button and then i've lost the value for hte username/password. Can anyone help me out and solve this little dilemma? I've attached my code and the relevant areas below. Look for ****************************************
Thanks,
Mike public class NamePass extends JFrame implements ActionListener
{
************* MY PRIVATE VAR STRATEGY WHICH DOESN'T WORK******
private JTextField name;
private JPasswordField pass;
public NamePass()
{
super("Username and Password");
setSize(290, 110);
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints constraints = new GridBagConstraints();
// TEXT: NAME
JPanel pane = new JPanel();
pane.setLayout(gridbag); // Name label
buildConstraints(constraints, 0, 0, 1, 1, 10, 40);
constraints.fill = GridBagConstraints.NONE; // Stretch component
constraints.anchor = GridBagConstraints.EAST; // Align
JLabel label1 = new JLabel("Name:", JLabel.LEFT); //Align
gridbag.setConstraints(label1, constraints); // Apply constraints to button
pane.add(label1); // Add Name text field
// TEXTFIELD: NAME
buildConstraints(constraints, 1, 0, 1, 1, 90, 0);
constraints.fill = GridBagConstraints.HORIZONTAL;
JTextField tfname = new JTextField();
gridbag.setConstraints(tfname, constraints);
pane.add(tfname); // password label
// TEXT: PASSWORD
buildConstraints(constraints, 0, 1, 1, 1, 0, 40);
constraints.fill = GridBagConstraints.NONE;
constraints.anchor = GridBagConstraints.EAST;
JLabel label2 = new JLabel("Password:", JLabel.LEFT);
gridbag.setConstraints(label2, constraints);
pane.add(label2); // password text field
// TEXTFIELD: PASSWORD
buildConstraints(constraints, 1, 1, 1, 1, 0, 0);
constraints.fill = GridBagConstraints.HORIZONTAL;
JPasswordField tfpass = new JPasswordField();
tfpass.setEchoChar('*');
gridbag.setConstraints(tfpass, constraints);
pane.add(tfpass); // OK Button
// BUTTON: OK
buildConstraints(constraints, 0, 2, 2, 1, 0, 20);
constraints.fill = GridBagConstraints.NONE;
constraints.anchor = GridBagConstraints.CENTER;
JButton okb = new JButton("OK");
******** I WANT TO PASS MY PASSWORD (tfpass) and USERNAME (tfuser) *****************************
okb.addActionListener(this); // Will check with datfile
************************************************************
gridbag.setConstraints(okb, constraints);
pane.add(okb); // Content Pane setContentPane(pane);
}
public void actionPerformed(ActionEvent pressbtn)
{
**********************************************
//Want to access pass and name private vars. How do I get to them
**********************************************
}
public static void main(String[] arguments)
{
NamePass frame = new NamePass();
ExitWindow exit = new ExitWindow();
frame.addWindowListener(exit);
frame.show();
}
}
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