palindrom

[cool dude]

this is wierd because it doesn't show any error in my code, but it doesn't show any output either. although i know that the output should be 9009 because 91 x 99 = 9009 and that is a palindrom since its the same number backwards.

code:

public class Problem4 {         public static void main (String[] args) {                 String palindrom = "";                 int product = 0;                 String product2 = "";                                 for (int j = 10; j <= 100; j++){                         for (int i = 10; i <= 100; i++){                                 product = j * i;                                 product2 = Integer.toString(product);                                 for (int k = 0; k < product2.length(); k++) {                                         palindrom = product2.substring(k, k + 1) + palindrom;                                 }                                 if (product2 == palindrom){                                         System.out.println(product2);                                 }                                 palindrom = "";                          }                 }         } }

[wtd]

You're trying to compare Strings with ==. This is probably not going to do what you expect. Once again, objects and native types in Java behave differently, and String is an object type.

[cool dude]

oh yeh. totally forgot. thanks