PalindromeNumber.java

package jpa.example.demo.algo;

/**
 * Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.
 *
 * Example 1:
 *
 * Input: 121
 * Output: true
 * Example 2:
 *
 * Input: -121
 * Output: false
 * Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
 * Example 3:
 *
 * Input: 10
 * Output: false
 * Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
 */
public class PalindromeNumber {

    public static boolean isPalindrome(int x) {
        String rawString = String.valueOf(x);
        int left = 0, right = rawString.length() - 1;
        while (left <= right) {
            if (rawString.charAt(left) == rawString.charAt(right)) {
                left++;
                right--;
            } else {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        int x = 10;
        System.out.println(isPalindrome(x));
    }

}