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

public class sally extends JFrame implements ActionListener{

    JLabel SnLabel, LnLabel, FnLabel, SubLabel;
    JTextField SnTextField, LnTextField, FnTextfield, SubTextfield;
    JButton OkButton;

public sally()
{
    setLayout(null);
    SnLabel = new JLabel("Student Number: ");
    LnLabel = new JLabel("Last Name: ");
    FnLabel = new JLabel("First Name: ");
    SubLabel = new JLabel("Subject: ");


    SnTextField = new JTextField("");
    LnTextField = new JTextField("");
    FnTextfield = new JTextField("");
    SubTextfield = new JTextField("");

    OkButton = new JButton("OK");


    SnLabel.setBounds(50, 50, 100, 20);
    LnLabel.setBounds(50, 80, 100, 20);
    FnLabel.setBounds(50, 110, 100, 20);
    SubLabel.setBounds(50, 140, 100, 20);

    SnTextField.setBounds(150, 50, 100, 20);
    LnTextField.setBounds(150, 80, 100, 20);
    FnTextfield.setBounds(150, 110, 100, 20);
    SubTextfield.setBounds(150, 140, 100, 20);

    OkButton.setBounds(110, 180, 100, 20);

    add(SnLabel);
    add(LnLabel);
    add(FnLabel);
    add(SubLabel);
    add(SnTextField);
    add(LnTextField);
    add(FnTextfield);
    add(SubTextfield);
    add(OkButton);


    OkButton.addActionListener(this);

}

    public void actionPerformed(ActionEvent event)
    {
        if (event.getSource()==OkButton)
        {
             JOptionPane.showMessageDialog(rootPane, "CONGRATULATIONS");
        }

        else
        {
            System.exit(0);


        }

    }



    public static void main(String[] args)
    {

        sally me = new sally();
        me.setSize(500, 300);
        me.setVisible(true);


    }
}
./////////////////////////////////////////////////////
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JOptionPane;

public class Sw extends JFrame implements ActionListener{

    JLabel unLabel, pwLabel;
    JTextField unTextField, pwTextField;
    JButton okButton, clearButton, exitButton;
public Sw()
{
    setLayout(null);
    unLabel = new JLabel("Username:");
    pwLabel = new JLabel("Password:");

    unTextField = new JTextField("");
    pwTextField = new JTextField("");

    okButton = new JButton("OK");
    clearButton = new JButton("RESET");
    exitButton = new JButton("EXIT");

    unLabel.setBounds(50, 50, 100, 20);
    pwLabel.setBounds(50, 80, 100, 20);

    unTextField.setBounds(150, 50, 100, 20);
    pwTextField.setBounds(150, 80, 100, 20);

    okButton.setBounds(50, 150, 100, 20);
    clearButton.setBounds(150, 150, 100, 20);
    exitButton.setBounds(250, 150, 100, 20);

    add(unLabel);
    add(pwLabel);
    add(unTextField);
    add(pwTextField);
    add(okButton);
    add(clearButton);
    add(exitButton);

    okButton.addActionListener(this);
    clearButton.addActionListener(this);
    exitButton.addActionListener(this);

}

    public void actionPerformed(ActionEvent event)
    {
        if (event.getSource()==clearButton)
        {
            unTextField.setText("");
            pwTextField.setText("");
        }
        else if (event.getSource()==exitButton)
        {
            System.exit(0);
        }
        else
        {
            if((unTextField.getText().equals("admin"))&&(pwTextField.getText().equals("123")))
            {

                sally me = new sally();
                me.setSize(500, 300);
                me.setVisible(true);


            }
        }

    }



    public static void main(String[] args)
    {

        Sw login = new Sw();
        login.setSize(500, 300);
        login.setVisible(true);


    }
}