Switch Case Considered as a Duplicate Label with JOptionPane.CANCEL_OPTION

Question

I am currently using IntelliJ and an error that says "Duplicate label '2'" appears when I am placing a case for pressing the CANCEL option in my menu.

import javax.swing.*;
public class Main {
   public static void main(String[] args){
      int choice=0;
         Object menu= "1. Name Constructor\n" +
                 "2. Pretty Printing of text\n" +
                 "3. FLAMES\n" +
                 "4. Your Superhero name!\n" +
                 "5. return to the main menu\n";
      do {
        choice = Integer.parseInt(JOptionPane.showInputDialog(null,
                "S T R I N G  M A N I P U L A T I O N  M E N U\n" +
      menu, "Menu", 1));
        switch (choice) {
            case 1:
                break;
            case 2:
                break;
            case 3:
                break;
            case 4:
                break;
            case 5:
                break;
            case JOptionPane.CANCEL_OPTION:
                break;
            default:
                JOptionPane.showMessageDialog(null,"Enter a valid  choice.","Error",1);
                break;
          }
       }while(choice!=5);
    }
}

Answer 1

That is happening because you can't define two cases with the same value in the switch statement.

If you take a look inside the JOptionPane, you'll see that the CANCEL_OPTION value is 2.

Here is the part of the JOptionPane class that shows the value:

/** Return value from class method if CANCEL is chosen. */ public static final int CANCEL_OPTION = 2;

As you already have a case 2: and the CANCEL_OPTION also returns 2, you have to change it. For example, if you change to case 6: it will work. Give it a try.

here you can see all the values that a JOptionPane has, so you can modify your case according to other values, so you don't get this duplicate case error anymore.