JOptionPane Input Dialog Cancel Button Is entering a Do While Loop

Asked Apr 15 '17 at 20:43

Active Apr 15 '17 at 20:43

Viewed 40 times

In the do while loop it checks if the user inputs any letters or 0 an that works well but when i click on the cancel button in the JOptionPane it enters the loop again instead of exiting theJOptionPane

do {
     try {

          op = JOptionPane.showInputDialog(null, "How Many Elements do you want in the universe?");
          opi = Integer.parseInt(op);

            if (op.equals("0")) {

                    JOptionPane.showMessageDialog(null, "The Universe cannot be empty");

                    try_Error = false;

                } else {

                    try_Error = true;
                }


            } catch (Exception e) {

                JOptionPane.showMessageDialog(null, "Enter Numbers Only");
                try_Error = false;
            }

        } while (!try_Error);

asked Apr 15 '17 at 20:43

BlazePage001

@Aaron It's a `JOptionPane.showInputDialog` the `Ok` and `cancel` button is in it – BlazePage001 Apr 15 '17 at 20:45
Test to see what the JOptionPane returns when cancel his pressed. Print the result out. Then test for that in your code. – Hovercraft Full Of Eels Apr 15 '17 at 20:46
@HovercraftFullOfEels It Prints `Enters Numbers Only` – BlazePage001 Apr 15 '17 at 20:47
No, you misunderstand me, -- what it **returns**. Print out the contents of the `op` variable immediately after it has been assigned the return value from the JOptionPane and see what it holds. – Hovercraft Full Of Eels Apr 15 '17 at 20:49
I *know* what it holds and could just tell you, but you need to learn how to discover these things yourself, and then change your code accordingly. – Hovercraft Full Of Eels Apr 15 '17 at 20:49
@HovercraftFullOfEels Oh `op` Returns `null` – BlazePage001 Apr 15 '17 at 20:50
***EXACTLY***. So test for null and act on it. – Hovercraft Full Of Eels Apr 15 '17 at 20:50
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/141794/discussion-between-blazepage001-and-hovercraft-full-of-eels). – BlazePage001 Apr 15 '17 at 20:51

JOptionPane Input Dialog Cancel Button Is entering a Do While Loop

0 Answers0