import javax.swing.JOptionPane;

package log;

public class Login {

    public static void main(String args[]) {

        String username = JOptionPane.showInputDialog("Enter your username");
        String password = JOptionPane.showInputDialog("Enter your password");

        if (

                username != null && password != null &&
                (

                    (username.equals("gkic17") && password.equals("irena46")) ||
                    (username.equals("dm") && password.equals("me21mar")) ||
                    (username.equals("citizenzap") && password.equals("guestboy19"))
                )
           )
        {
                JOptionPane.showMessageDialog(null, "Logged in!" );
        }   else {
                JOptionPane.showMessageDialog(null, "Incorrect username or password! Try again later." );
        }
    }
}