Use recursion to implement a method

public static int indexOf(String text, String str)

that returns the starting position of the first substring of the text that matches str. Return –1 if str is not a substring of the text.

For example, s.indexOf("Mississippi", "sip") returns 6.

Hint: This is a bit trickier than Exercise E13.8, because you must keep track of how far the match is from the beginning of the text. Make that value a parameter variable of a helper method.

Data from Exercise E13.8

Use recursion to implement a method 

public static boolean find(String text, String str)

that tests whether a given text contains a string. For example, find("Mississippi", "sip") returns true.

Hint: If the text starts with the string you want to match, then you are done. If not, consider the text that you obtain by removing the first character.