Login/Senha

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class LoginSwingEventoC extends JFrame implements ActionListener,
KeyListener, WindowListener {

JButton jbut1, jbut2, jbut3;
JTextField jtext1, jtext2;
JPasswordField password;
char charArray[];

LoginSwingEventoC()
{
	JLabel jlbl1 = new JLabel("Nome: ");
	JLabel jlbl2 = new JLabel("Senha: ");
	
	jtext1 = new JTextField(20);
	jtext2 = new JTextField(20);
	
	jbut1 = new JButton("OK");
	jbut2 = new JButton("LIMPAR");
	jbut3 = new JButton("CANCEL");
	
	password = new JPasswordField("1234"); 
		
	charArray = new char[4];
	
	jbut1.addActionListener(this);
	jbut2.addActionListener(this);
	jbut3.addActionListener(this);
	password.addActionListener(this);
	
	
	jtext2.keyListener(
			new keyPressed(){
				public void actionPerformed(KeyEvent e)
				{
					String psaux = new String(password.getPassword());
					String s = new String("1234");
					for(int i=0; i < psaux.length()-1; i++)
						if(psaux.charAt(i)== s.charAt(i))
							jtext2.setText("*");
				}
			});
	
	JPanel jmain = new JPanel();
	jmain.setLayout(new BorderLayout());
	
	JPanel p1 = new JPanel();
	JPanel p2 = new JPanel();
	JPanel p3 = new JPanel();
		
	p1.setLayout(new GridLayout(2,1));
	p1.add(jlbl1);
	p1.add(jlbl2);
	
	p2.setLayout(new GridLayout(2,1));
	p2.add(jtext1);
	p2.add(jtext2);
							
	p3.setLayout(new FlowLayout(FlowLayout.CENTER));
	p3.add(jbut1);
	p3.add(jbut2);
	p3.add(jbut3);
	
	jmain.add("West", p1);
	jmain.add("East", p2);
	jmain.add("South", p3);
	
	setContentPane(jmain);
	pack();
	setVisible(true);
}

public void actionPerformed(ActionEvent ev)
{
	Object src = ev.getSource();
	
	String r = "";
		
	if(src==jbut1)
		JOptionPane.showMessageDialog(null, password);
	else if(src == jbut2)
		JOptionPane.showMessageDialog(null, password);
	else if(src == jbut3)
		System.exit(0);
}

	public void windowActivated(WindowEvent evt) {}
	public void windowClosed(WindowEvent evt) {}
	public void windowDeactivated(WindowEvent evt) {}
	public void windowDeiconified(WindowEvent evt) {}
	public void windowIconified(WindowEvent evt) {}
	public void windowOpened(WindowEvent evt) {}
	public void windowClosing(WindowEvent event) {
		System.exit(0);
	}

	public void keyPressed(KeyEvent event) {}

	public void keyReleased(KeyEvent event) {}

	public void keyTyped(KeyEvent event) {}
	
	public static void main (String args[])
	{
		LoginSwingEventoC app = new LoginSwingEventoC();
		
		app.addWindowListener(
				new WindowAdapter() {
					public void windowClosing(WindowEvent e)
					{
						System.exit(0);
					}
				}
		);
	}

}