Simple JOptionPane examples in Java

Password.java

/*****************************************************
*
*		Program Name:	Password
*
*		Author:		Henry Nichols
*
*		Remarks:	JOptionPane examples
*
*****************************************************/

/**********************************
*    Imports
**********************************/
import javax.swing.JOptionPane;
import java.text.*;

class Password
{
	public static void main(String args[])
	{
		/************************************
		*  input dialog - ask for a User ID
		************************************/
		String userID = JOptionPane.showInputDialog
			(null, "Please enter your user name", "Input", JOptionPane.QUESTION_MESSAGE );

		/*****************************************
		*  input dialog - ask for user password
		*****************************************/
		String password = JOptionPane.showInputDialog
			(null, "Please enter your password", "Input", JOptionPane.QUESTION_MESSAGE );

		/************************************************************
		*  if/else if branch for user ID and password authentication
		************************************************************/
		if(userID.equals("admin") && password.equals("open"))
		{
			JOptionPane.showMessageDialog
			(null, "welcome", "Administrative Logon", JOptionPane.PLAIN_MESSAGE );
		}
		else if(userID.equals("admin") & !(password.equals("open")))
		{
			JOptionPane.showMessageDialog
			(null, "invalid password", "Administrative Logon", JOptionPane.ERROR_MESSAGE);
		}
		else if(!(userID.equals("admin")) & password.equals("open"))
		{
			JOptionPane.showMessageDialog
			(null, "invalid user id", "Administrative Logon", JOptionPane.ERROR_MESSAGE);
		}
		else
		    JOptionPane.showMessageDialog
			(null, "invalid user id and password", "Administrative Logon", JOptionPane.ERROR_MESSAGE);

		System.exit(0);
	} // end main
} // end class