Java Substring Comparisons

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        public static String getSmallestAndLargest(String s, int k) {
            java.util.SortedSet<String> set = new java.util.TreeSet<String>();
            int len = s.length() - k;
            for(int i = 0; i<=len;i++){
                set.add(s.substring(i, i+k));            
            }              
            return set.first() + "\n" + set.last();
        }