import javax.swing.JOptionPane;

public class UserInputNested {

	public static void main(String[] args) {

		String Username = JOptionPane.showInputDialog("Username: "); //Sets the variable Username to the input that user types.

		if (
			(Username != null) && //Checks to see if user types something
			(Username.equals("Sabih")) //And if user types Sabih
		   ) {
			String Password = JOptionPane.showInputDialog("Password: ");

			if (Password.equals("Hasan")) {
				JOptionPane.showMessageDialog
				(null, "You now have access to the System", "System Access", JOptionPane.INFORMATION_MESSAGE);
			} else {
				JOptionPane.showMessageDialog
				(null, "Incorrect Password", "Password", JOptionPane.ERROR_MESSAGE);
			}


		} else { //If user does not type Sabih
			JOptionPane.showMessageDialog
			(null, "Username can't be identified", "Username", JOptionPane.ERROR_MESSAGE);

		}

	}

}