Palindrome Number

Palindrome Number 

Determine whether an integer is a palindrome. Do this without extra space.

public class Solution {
    public boolean isPalindrome(int x) {
        boolean isPal = true;
        String str = String.valueOf(x);
        for(int i = 0, j = str.length() - 1; i <= j; i++, j--){
            if(str.charAt(i) != str.charAt(j)){
                isPal = false;
                break;
            }
        }
        return isPal;
    }
}