Java tutorial
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JPasswordField; public class Main extends JFrame { JPasswordField field = new JPasswordField("*", 10); public Main() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); field.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println("Field=" + field.getText()); } }); getContentPane().add(field); pack(); setVisible(true); } public static void main(String arg[]) { new Main(); } }