# 0125. Valid Palindrome
###### tags: `Leetcode` `Easy` `FaceBook` `Palindrome`
Link: https://leetcode.com/problems/valid-palindrome/
## 注意语法~
string upperCase to lowerCase

判断是否是标点

Character upperCase to lowerCase

## Code

class Solution {
public boolean isPalindrome(String s) {
char[] charArray = s.toCharArray();
int start = 0;
int end = s.length()-1;
while(start<end){
if(Character.isLetterOrDigit(charArray[start])&&Character.isLetterOrDigit(charArray[end])){
if(Character.toLowerCase(charArray[start])==Character.toLowerCase(charArray[end])){
start++;
end--;
}
else{
return false;
}
}
if(!Character.isLetterOrDigit(charArray[start]))start++;
if(!Character.isLetterOrDigit(charArray[end]))end--;
}
return true;
}
}