/* Given a string and an int n, return a string made of the first n * characters of the string, followed by the first n-1 characters of the * string, and so on. You may assume that n is between 0 and the length of * the string, inclusive (i.e. n >= 0 and n <= str.length()). */ public String repeatFront(String str, int n) { StringBuffer result = new StringBuffer(); for(int i = n; i > 0; i--) result.append(str.substring(0, i)); return result.toString(); }