Here, we find the number power which is 10^(numDigits-1). Use two iterators one from the end one from the beginning of the number.

```
public boolean isPalindrome(int x) {
if (x < 0) return false;
int power = 1;
for (int n = x; (n/10) > 0; n /= 10, power *= 10) { ; }
for (int n = 1; n < power; power /= 10, n *= 10) {
if ( ((x/power) % 10) != ((x/n) % 10) ) return false;
}
return true;
}
```