Isomorphic Strings

Leetcode 205.

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class Solution {
    public boolean isIsomorphic(String s, String t) { 
      int[] s1 = new int[256];
      int[] t1 = new int[256];
      for(int i = 0; i < s.length();i++){
          char sc = s.charAt(i);
          char tc = t.charAt(i);
          if(s1[sc] != t1[tc])
             return false;
          s1[sc] = i + 1;
          t1[tc] = i + 1; 
      }
    return true; 
    }
}