JPasswordField with ActionListner

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


class PasswordField implements ActionListener{
    JFrame frame;
    JPasswordField pass;
    JButton b1;
    JTextField t1;
    JLabel l1;
    PasswordField(){
        frame = new JFrame();
        frame.setLayout(new GridLayout(2,3));
        pass = new JPasswordField();
        t1 = new JTextField(1);
        l1 = new JLabel("Typed Password:");
        b1 = new JButton("Change Bullet:");

        b1.addActionListener(this);
        pass.addActionListener(this);

        //changing the echo character that is displayed while entering password in JPasswordField




        frame.add(pass);
        frame.add(t1);
        frame.add(b1);
        frame.add(l1);
        frame.setSize(400,400);
        frame.setVisible(true);

    }
    public void actionPerformed(ActionEvent event){
                  char a = t1.getText().charAt(0);
                  System.out.println(event.getSource());
                  pass.setEchoChar(a);
                  l1.setText("Typed Password:"+pass.getPassword());

    }

}

public class GUI{

        public static void main(String[] args){

            new PasswordField();

        }


}