JPasswordField

public class MyForm extends JFrame {

    public MyForm() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setBounds(100, 100, 362, 249);

        setTitle("Kittisay Java");

        setLayout(null);

        // Password Field

        JPasswordField password = new JPasswordField();

        password.setBounds(108, 26, 139, 20);

        add(password);

        // Label

        JLabel lbl = new JLabel("Result");

        lbl.setBounds(103, 120, 144, 14);

        add(lbl);

        // Button

        JButton btn1 = new JButton("Button 1");

        btn1.addActionListener((e) -> {

            String passText = new String(password.getPassword());

            lbl.setText("Password = " + passText);

        });

        btn1.setBounds(128, 72, 99, 23);

        add(btn1);

    }

    public static void main(String[] args) {

      MyForm frm = new MyForm();

      frm.setVisible(true);

    }