firstUnique.java

public class firstUnique
{
    public static void main()
    {
        System.out.println(findFirstUnique("aabbcc"));
        System.out.println(findFirstUnique("abbcc"));
        System.out.println(findFirstUnique("aabcc"));
        System.out.println(findFirstUnique("aabbc"));
    }
    public static int findFirstUnique(String s)
    {
        for(int i = 0; i<s.length(); i++)
        {
            if(s.lastIndexOf(s.charAt(i))==s.indexOf(s.charAt(i)))
                return i;
        }
        return -1;
    }
}