Trying to print a list using JOptionPane

Question

I am very new to Java and programming, so please forgive me if this should be apparent. I wrote a program for school which was for ordering pizzas. I wrote it as a console program and after much frustration it finally worked. Now I am trying to change it to a GUI program using JOptionPane. I was hoping that since I already had the logic written and working, I could focus on the GUI aspect. I was wrong. I want to print a list of enums on a JOptionPane and cannot figure out how to do it My code in the console program was:
System.out.println("The available crust styles are: ");
     for(Pizza.Style style : Pizza.Style.values())
          System.out.println(style+" ");
So how can I iterate through the for loop to list all of the styles in the JOptionPane? Do I need to turn it into a method with a return and then cal the method like
JOptionPane.showMessageDialog(null, crustMethod()); ??

Answer 1

OP said:
... Now I am trying to change it to a GUI program using JOptionPane. I was hoping that since I already had the logic written and working, I could focus on the GUI aspect. I was wrong. ...I wouldn't use JOptionPane. You need JFrame and maybe, but I doubt it, a JDialog. OP, the GUI is more than likely to be nothing more than a form that allows users to set certain properties or fields in a Java class. For example let's say we have this class.
public class Point
  public int x;
  public int y;
}Then a GUI for this would be something like a JPanel with two (2) JLabels and two (2) JTextFields. Maybe something like so...
import java.awt.*;
import javax.swing.*;
public class PointGUI extends JPanel
  public JLabel xLabel = new JLabel("Coordinate X:");
  public JLabel yLabel = new JLabel("Coordinate Y:");
  public JTextField xField = new JTextField(4);
  public JTextField yField = new JTextField(4);
  public PointGUI(){
    setLayout(new GridLayout(2, 2));
    add(xLabel);
    add(xField);
    add(yLabel);
    add(yField);
}Then to run the program...
import javax.swing.*;
public class Test
  public static void main(String[] args){
    SwingUtitlities.invokeLater(new Runnable(){
      public void run(){
        PointGUI gui = new PointGUI();
        JFrame f = new JFrame("PointGUI");
        f.getContentPane().add(gui, "Center");
        f.pack();
        f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
        f.setVisible(true);
}... actually all the program does is display the GUI. But, can you see that the GUI's JLabels and JTextFields describe all the public properties of the Point class? Can you see that the entire GUI can be placed anywhere in a JFrame, or maybe even in a JDialog? From this point on, you can add other functions and features to your classes, GUI's and the main apps that run them.
A hint on your project, you may need to write a Pizza class that decribes all the things a single pizza can be - then come up with a GUI for that and an app that runs it.