panel - panel

public class TestNo3 {

    public static void main(String[] args) {
        No3 tiga = new No3();
        tiga.setVisible(true);
    }
}

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
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.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

/**
 *
 * @author admin
 */
    public class No3 extends JFrame implements ActionListener {

    private static final int FRAME_WIDTH = 1000;
    private static final int FRAME_HEIGHT = 800;
    private static final int FRAME_X_ORIGIN = 150;
    private static final int FRAME_Y_ORIGIN = 250;
    private JMenu utama1;
    private JMenu utama2;
    private String nm2,pass2;
    private JMenuItem psswd, exit;
    private JButton okButton;
    private static final int BUTTON_WIDTH = 80;
    private static final int BUTTON_HEIGHT = 30;
    private JPanel panel1, panel2;
    Container contentPane;
    JLabel nama, password;
    JTextField nm, pass;


    public No3() {

        setTitle("Password");
        setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setResizable(false);
        setLocation(FRAME_X_ORIGIN, FRAME_Y_ORIGIN);
        contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());

        createpanel1();
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        menuBar.add(utama1);

        setDefaultCloseOperation(EXIT_ON_CLOSE);


    }

    public void quitAction() {

        System.exit(0);

    }

    private void createpanel1() {
        utama1 = new JMenu("File");

        psswd = new JMenuItem("Menu Password");
        psswd.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                passwordAction();
            }
        });

        utama1.add(psswd);

        utama1.addSeparator();
        exit = new JMenuItem("Quit");
        exit.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                quitAction();
            }
        });
        utama1.add(exit);

    }

    public void passwordAction() {
        panel1 = new JPanel();
        panel1.setLayout(new GridLayout(2, 2));

        nama = new JLabel();
       
        nama.setText("Input your UserName : ");
        nm = new JTextField();
        nm.setColumns(20);
        password = new JLabel();
        password.setText("Input your Password: ");
        pass = new JTextField();
        pass.setColumns(20);

        panel1.add(nama);
        panel1.add(nm);
        panel1.add(password);
        panel1.add(pass);
        contentPane.add(panel1);
        panel1.revalidate();
        panel1.setVisible(true);

        panel2 = new JPanel();
        panel2.setLayout(new FlowLayout());

        okButton = new JButton("OK");
        okButton.setSize(BUTTON_WIDTH, BUTTON_HEIGHT);
        okButton.addActionListener(this);
        panel2.add(okButton);
        contentPane.add(panel2);
        panel2.revalidate();
        panel2.setVisible(true);
    }

    public void actionPerformed(ActionEvent l) {
      
        nm2 = nm.getText();
        pass2 = pass.getText();
        if (nm2.equals("root") && pass2.equals("admin")) {
            JOptionPane.showMessageDialog(null, "password ok");
        } else {
            JOptionPane.showMessageDialog(null, "masukkan salah");
        }

    }
}