import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class PruebaPass {

    public static void main(String[] args) {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(640, 480);
        frame.setLocationRelativeTo(null);
        frame.setLayout(new FlowLayout(FlowLayout.CENTER, 640, 5));

        JPanel pUsername = new JPanel();
        JLabel lUsername = new JLabel("  Username");
        JTextField fUser = new JTextField(10);
        pUsername.add(lUsername);
        pUsername.add(fUser);
        frame.getContentPane().add(pUsername);

        JPanel pPassword = new JPanel();
        JLabel lPassword = new JLabel("  Password");
        JPasswordField fPass = new JPasswordField(10);
        pPassword.add(lPassword);
        pPassword.add(fPass);
        frame.getContentPane().add(pPassword);

        JButton enviar = new JButton("Enviar");
        frame.getContentPane().add(enviar);

        enviar.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                String username = fUser.getText();
                char[] password = fPass.getPassword();
                System.out.println(username);
                System.out.println(password);
            }

        });

        frame.setVisible(true);
    }
}