标签：tco int end targe ems eterm pen title alpha relative
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
For example,
"A man, a plan, a canal: Panama" is a palindrome.
"race a car" is not a palindrome.
public class Solution {
public boolean isPalindrome(String s) {
if (s == null) {
return false;
}
if (s.length() == 0 || s.length() == 1) {
return true;
}
StringBuffer sb = new StringBuffer();
for (int i = 0; i < s.length();i++){
Character ch = s.charAt(i);
if(Character.isLetter(ch) || Character.isDigit(ch)){
sb.append(Character.toUpperCase(ch));
} else {
continue;
}
}
int start = 0 ;
int end = sb.length() - 1;
while ( start < end) {
if (sb.charAt(start) == sb.charAt(end)) {
start ++;
end --;
} else {
return false;
}
}
return true;
}
}标签：tco int end targe ems eterm pen title alpha relative
原文地址：http://www.cnblogs.com/yfceshi/p/7015635.html
