[JAVA] Rewrite the following pieces of code as a recursive method.

Write a recursive method for converting a string of digits into the integer it represents. For example, "12341 represents the integer 12341. Hint: Process the string left to right. public int strToNum (String str) ( if(str.length)1) return 0 else return ((str.charAt (str.length() - 1)-0') + (10 * strToNum(str.substring (0, str.length) - 1)))); Write a recursive method that counts the number of nodes in a singly linked list. private int countNodes (Node trav) if (trav null) return 0 return 1 countNodes (trav.next)