Are given characters of a string form palindrome?

Using the all characters of a given String how to specify either a palindrome or not.
Ex:-
1) String="teste"
After arrange all character we can made a palindrome String as "teset"
So output is TRUE.
2)String="hello"
we can not made a palindrome String
output is FALSE

Sort the given string and after call the below method

boolean isFormingPalindrome(String s) {

//Assume we are taking sorted string as an argument

  if (s == null || s.length() == 0 || s.length() == 1)
   return true;
  int length = s.length();
  // if it has even number of characters,it should have zero non repeated
  // characters. else it should have one non repeated character
  boolean isFirstNonRepeated = false;
  if (length % 2 == 0) {
   // for even length,there will not be any
   // non repeated characters
   isFirstNonRepeated = true;
  }

  char[] characters = s.toCharArray();
  for (int i = 1; i < length; i = i + 2) {
   if (characters[i - 1] != characters[i]) {
    if (isFirstNonRepeated) {
     return false;
    } else {
     i = i - 1;
     isFirstNonRepeated = true;
    }
   }
  }
  return true;
 }