Palindrome String.md

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

Example:

"A man, a plan, a canal: Panama" is a palindrome.

"race a car" is not a palindrome.

Return 0 / 1 ( 0 for false, 1 for true ) for this problem

code:

public class Solution {
    public int isPalindrome(String A) {
        A = A.toUpperCase();
        //System.out.println(A);
        int l = A.length()-1;
        for(int i =0;i<A.length()/2 ; i++){
            //System.out.println(A.charAt(i) + " and" + A.charAt(l) + i+" " +l);
            if(!Character.isLetterOrDigit(A.charAt(i)) || A.charAt(i) == ' ')
            {
                continue;
            }
            else if(!Character.isLetterOrDigit(A.charAt(l)) || A.charAt(i) == ' ')
            {
                l--;
                i--;
            }
            else
            {
                if(!(A.charAt(i) == A.charAt(l)))
                {
                   // System.out.print(A.charAt(i) + " and" + A.charAt(l) + i+" " +l);
                return 0 ;
                }
                l--;
            }
        }
        return 1;
    }
}