Checking if two strings are permutations of each other

Question

How to determine if two strings are permutations of each other

Answer 1

public boolean permitation(String s,String t){
      if(s.length() != t.length()){
          return false;
          }

       int[] letters = new int[256];//Assumes that the character set is ASCII
       char[] s_array = s.toCharArray();

       for(char c:s_array){         /////count number of each char in s
             letters[c]++;
        }
       for(int i=0;i