HasUniqueChars.java

import java.util.*;

public class HasUniqueChars
{
    public static boolean hasUniqueChars(String toTest)
    {
        char charArray[] = toTest.toCharArray();
        Arrays.sort(charArray);

        for (int x = 1; x < charArray.length; x++)
        {
            if ( charArray[x] == charArray[x-1] )
                return false;
        }

        return true;
    }


    public static void main(String args[])
    {
        String testData[] = {
            "abc",
            "abcc",
            "abcdefhi",
            "abcdefhiabcdefhi",
            "ccc",
            "xxxkjsdfkjqqqdkjfd",
            "abcdefghijklmnopqrstuvwxyz",
        };

        for (String test : testData)
        {
            if ( hasUniqueChars(test) )
            {
                System.out.println("  hasUniqueChars(\"" + test + "\")");
            }
            else
            {
                System.out.println("! hasUniqueChars(\"" + test + "\")");
            }
        }
    }
}

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