Easiest way of checking if a string consists of unique characters?

Question

I need to check in Java if a word consists of unique letters (case insensitive). As straight solution is boring, I came up with:

1. For every char in a string che

Answer 1

           import java.io.*;

                   class unique
                  {
                           public static int[] ascii(String s)
                           {
                                    int length=s.length();
                                    int asci[] = new int[length];
                                    for(int i=0;i=0 && temp

}