creditsystem LocalApplication v2.java

import javax.swing.JOptionPane;

/* other options for creatine JOptionPane dialogs

JOptionPane.showMessageDialog(frame, "text here", "title here", JOptionPane.ERROR_MESSAGE); //custom title, error icon
JOptionPane.showMessageDialog(frame,    "text here", "title here", JOptionPane.INFORMATION_MESSAGE,icon); //custom title & icon

Object[] options = {"Yes!", "No, thanks", "Not Sure"};
int n = JOptionPane.showOptionDialog(frame, "question here ", "custom title",
                    JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null,  options,  options[2]);

http://download.oracle.com/javase/tutorial/uiswing/components/dialog.html#api
 */


public class LocalApplication
{
    public static void displayCredit()
    {
        double tempBalance = Credit.getCreditBalance();
        JOptionPane.showMessageDialog( null, "Credit Balance = " + tempBalance );
    }

    public static int validateMenuChoice(String response)
    {
        int choice = 0;

        if( response != null && !response.isEmpty() )
        {
            try{
                choice = Integer.parseInt( response );
                return choice;

            }catch( NumberFormatException e)
            {       return 0;
            }
        }

        return 0;
    } // end validateMenuChoice

    public static void main(String[] args)
    {
        String response;
        int choice = 0;

        response = JOptionPane.showInputDialog( "Do you want to modify Credits? (yes)");
        if( response != null && response.equals( "yes" ) )
        {
            while( choice != 4 )
            {
              response = null;
                response = JOptionPane.showInputDialog( "1 = Increase Credit , 2 = Decrease Credit, 3 = Show Current Credit, 4 = Quit");
                choice =  validateMenuChoice( response );

                switch( choice )
                {
                    case 1:
                        Credit.increaseCredit( 1 );
                  break;
                    case 2:
                        Credit.decreaseCredit( 1 );
                  break;
                    case 3:
                        displayCredit();
                  break;
                    case 4:
                        // cleanup before quitting?
                  break;
                  default:
                    JOptionPane.showMessageDialog( null, "Please enter one of the digits from the menu" );
                  break;
                } //end switch
            } //end while
        }

        JOptionPane.showMessageDialog( null, "Thank you!" );
    } //end main
} //end class