How to use the cancel button in showInputDialog

Question

um how would i go with overriding the cancel button's deafult function in JOptionPane.showInputDialog?
in my code:
package alphaOne;
* this program takes in a number and gets the factorial of that number
import javax.swing.*;
public class Factorial {
     public Factorial() {
           * variables intilization, input is where the option pane puts the data
           * number is teh actucal number entered parsed from string result is
           * where the resutl is stored flag1 is the indicator if the user had
           * entered an integer
          String input;
          int flag1 = 0;
          int number = 0;
          long result = 0;
           * this while loop runs continously unless an integer is entered
          while (flag1 != 1)
               try {
                    input = JOptionPane
                              .showInputDialog("Enter the number to be factored, Integer only: ");
                    number = Integer.parseInt(input);
                    flag1 = 1;
               } catch (NumberFormatException ea) {
                    JOptionPane.showMessageDialog(null,
                              "The input was not a integer!", "Warning",
                              JOptionPane.ERROR_MESSAGE);
          result = number;
          for (int x = 1; x < number; x++) {
               result = result * (x);
          JOptionPane.showMessageDialog(null, "The result is: " + result,
                    "Result", JOptionPane.CLOSED_OPTION);
          try {
               System.exit(0);
          } catch (SecurityException ea) {
               System.out.print("ARRRRR its dead!");
     public static void main(String[] args) {
          Factorial One = new Factorial();
}the cancel button does not break the while loop

Answer 1

what is the value of null compared to when you compare it, and do we use the String.equals() or the String == null to compare? as seen in here i tried with input.equals(null) as a comparison but it deos not exit when i press cancel
package alphaOne;
* this program takes in a number and gets the factorial of that number
import javax.swing.*;
public class Factorial {
     public Factorial() {
           * variables intilization, input is where the option pane puts the data
           * number is teh actucal number entered parsed from string result is
           * where the resutl is stored flag1 is the indicator if the user had
           * entered an integer
          String input;
          boolean flag1 = false;
          int number = 0;
          long result = 0;
           * this while loop runs continously unless an integer is entered
          while (flag1 != true){
               try {
                    input = JOptionPane
                              .showInputDialog("Enter the number to be factored, Integer only: ");
                    number = Integer.parseInt(input);
                    System.out.println(input);
                    flag1 = true;
                    if (input.equals(null))
                         try {
                              System.exit(0);
                         } catch (SecurityException ea) {
                              System.out.print("ARRRRR its dead!");
               } catch (NumberFormatException ea) {
                    JOptionPane.showMessageDialog(null,
                              "The input was not a integer!", "Warning",
                              JOptionPane.ERROR_MESSAGE);
          result = number;
          for (int x = 1; x < number; x++) {
               result = result * (x);
          JOptionPane.showMessageDialog(null, "The result is: " + result,
                    "Result", JOptionPane.INFORMATION_MESSAGE);
          try {
               System.exit(0);
          } catch (SecurityException ea) {
               System.out.print("ARRRRR its dead!");
     public static void main(String[] args) {
          Factorial One = new Factorial();
}i have also tried to ue input == null, input == "", input.equals(""), input.equals(" ")
Message was edited by:
TheHolyLancer
i edited the part so it is bold
Message was edited by:
TheHolyLancer