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

class Login extends JFrame implements ActionListener
{
 JButton SUBMIT;
 JPanel panel;
 JLabel label1,label2;
 final JTextField  text1,text2;
	Login()
	{
	    label1 = new JLabel();
		label1.setText("Username:");
		text1 = new JTextField(20);

		label2 = new JLabel();
		label2.setText("Password:");
	    text2 = new JPasswordField(20);
	    //this.setLayout(new BorderLayout());

		SUBMIT=new JButton("SUBMIT");

        panel=new JPanel(new GridLayout(3,1));
		panel.add(label1);
		panel.add(text1);
		panel.add(label2);
		panel.add(text2);
		panel.add(SUBMIT);
	    add(panel,BorderLayout.CENTER);
        SUBMIT.addActionListener(this);
        setTitle("LOGIN FORM");
	}
   public void actionPerformed(ActionEvent ae)
	{
		String value1=text1.getText();
		String value2=text2.getText();
        if (value1.equals("admin") && value2.equals("admin")) {
		NextPage page=new NextPage();
		page.setVisible(true);
		JLabel label = new JLabel("Selamat Datang : "+value1);
        page.getContentPane().add(label);
	}
		else{
			System.out.println("enter the valid username and password");
			JOptionPane.showMessageDialog(this,"Password Anda Salah","Maaf !!",JOptionPane.ERROR_MESSAGE);
	}
}
}
 class LoginDemo
{
	public static void main(String arg[])
	{
		try
		{
		Login frame=new Login();
		frame.setSize(300,100);
		frame.setVisible(true);
		}
	catch(Exception e)
		{JOptionPane.showMessageDialog(null, e.getMessage());}
	}
}


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

class NextPage extends JFrame
{
	NextPage()
 	{
	   setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
	   setTitle("Welcome");
       setSize(400, 200);

	}
 }