/* Given a string of any length, return a new string where the last 2 chars, * if present, are swapped, so "coding" yields "codign". */ public String lastTwo(String str) { if(str.length() < 2) return str; return str.substring(0, str.length() - 2) + str.charAt(str.length() - 1) + str.charAt(str.length() - 2); }