Java tutorial
import java.awt.BorderLayout; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JPasswordField; public class Main extends JFrame { public static void main(String[] args) { Main that = new Main(); that.setVisible(true); } public Main() { setSize(450, 350); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); getContentPane().add(new PasswordPanel(), BorderLayout.SOUTH); } } class PasswordPanel extends JPanel { JPasswordField pwf; public PasswordPanel() { pwf = new JPasswordField(10); add(pwf); pwf.addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent e) { System.out.println(new String(pwf.getPassword())); } }); } }