Write a recursive method replaceAll in the class RecStuff which will replace all occurrences of an old word with a new word in all files with the suffix .txt in a given directory and in sub-directories of that directory (You are changing file contents). The signature for this method is as follows:

public static void replaceAll(String sPath, String sOldWord, String sNewWord)

can't use buffer reader and file reader and filewriter we use printwriter.