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JDialog question

Posted on 2002-07-10
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Last Modified: 2010-03-31
Hi,
in my swing application, when a button is clicked, I would like to pop-up a dialog, asking the user to fill in login and password, if it is right, then close the dialog,
and the parent screen will go to another new screen.

How to do this?
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Question by:stanleyhuen
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3 Comments
 
LVL 9

Accepted Solution

by:
Ovi earned 200 total points
ID: 7145262
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test extends JFrame {
  public test() {
    init();
  }
 
  private void init() {
    setSize(300, 200);
    JButton button = new JButton("Press me!");
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        (new PasswordChecker(test.this)).setVisible(true);
      }
    });
    getContentPane().add(button);
    setVisible(true);
  }
 
 
  class PasswordChecker extends JDialog {
    JTextField user;
    JPasswordField password;
    JButton ok;
    JButton cancel;
   
    public PasswordChecker(JFrame parent) {
      super(parent, "User check", true);
      initDlg();
      initListeners();
    }
   
    protected void initDlg() {
      setSize(300, 150);
      Container c = this.getContentPane();
      c.setLayout(new BorderLayout());
     
      user = new JTextField();
      password = new JPasswordField();
      ok = new JButton("Ok");
      cancel = new JButton("Cancel");
     
      JPanel p = new JPanel();
      p.setLayout(new GridLayout(2, 2, 5, 5));
      p.add(new JLabel("User : "));
      p.add(user);
      p.add(new JLabel("Password : "));
      p.add(password);
     
      JPanel p1 = new JPanel();
      p1.add(ok);
      p1.add(cancel);
     
      c.add(p, BorderLayout.CENTER);
      c.add(p1, BorderLayout.SOUTH);
    }
   
    protected void initListeners() {
      ok.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
       String usr = user.getText();
       String pwd = new String(password.getPassword());
       if(usr.equalsIgnoreCase("test") && pwd.equalsIgnoreCase("test")) {
         JOptionPane.showMessageDialog(test.this, "User accepted!");
         closeDlg();
         return;
       }
          JOptionPane.showMessageDialog(test.this, "Authentication failed!");
     }
      });
      cancel.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
          closeDlg();
     }
      });
    }
   
    protected void closeDlg() {
      setVisible(false);
      dispose();
    }
  }
 
  public static void main(String[] args) {
    new test();
  }
}
0
 

Author Comment

by:stanleyhuen
ID: 7168916
How can I pass a boolean value from the PasswordChecker class to the main class?

I want to do some thing if it is successfully Authentication, do other thing if it is not.
0
 
LVL 9

Expert Comment

by:Ovi
ID: 7169427
By implementing something similar to JOptionPane, like (code is not tested but should work fine) :
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test extends JFrame {
  public test() {
    init();
  }
 
  private void init() {
    setSize(300, 200);
    final JButton button = new JButton("Press me!");
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        button.setText(PasswordChecker.showDialog(test.this));
      }
    });
    getContentPane().add(button);
    setVisible(true);
  }
 
 
  class PasswordChecker extends JDialog {
    static boolean accepted = false;
    JTextField user;
    JPasswordField password;
    JButton ok;
    JButton cancel;
   
    public PasswordChecker(JFrame parent) {
      super(parent, "User check", true);
      initDlg();
      initListeners();
    }
   
    protected void initDlg() {
      setSize(300, 150);
      Container c = this.getContentPane();
      c.setLayout(new BorderLayout());
     
      user = new JTextField();
      password = new JPasswordField();
      ok = new JButton("Ok");
      cancel = new JButton("Cancel");
     
      JPanel p = new JPanel();
      p.setLayout(new GridLayout(2, 2, 5, 5));
      p.add(new JLabel("User : "));
      p.add(user);
      p.add(new JLabel("Password : "));
      p.add(password);
     
      JPanel p1 = new JPanel();
      p1.add(ok);
      p1.add(cancel);
     
      c.add(p, BorderLayout.CENTER);
      c.add(p1, BorderLayout.SOUTH);
    }
   
    protected void initListeners() {
      ok.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
       String usr = user.getText();
       String pwd = new String(password.getPassword());
       if(usr.equalsIgnoreCase("test") && pwd.equalsIgnoreCase("test")) {
         JOptionPane.showMessageDialog(test.this, "User accepted!");
         accepted = true;
         closeDlg();
         return;
       }
          JOptionPane.showMessageDialog(test.this, "Authentication failed!");
       accepted = false;
     }
      });
      cancel.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
          accepted = false;
          closeDlg();
     }
      });
    }

    public static final boolean showDialog(JFrame parent) {
      accepted = false;
      (new PasswordChecker(parent)).setVisible(true);
      return(accepted);
    }
   
    protected void closeDlg() {
      setVisible(false);
      dispose();
    }
  }
 
  public static void main(String[] args) {
    new test();
  }
}
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