Recursive helper method: The recursive helper method is used to identify how far the recursion has already proceeded or how far it still has to proceed. A task may often be solved by handing it over to a recursive helper method. The recursive helper method can be defined by slightly changing the original recursive method. Example for recursive helper method: Consider the method “public boolean isPalindrome(int start, int end)” used to check a sentence is palindrome or not. Sometimes this method is inefficient for constructing the new sentences. So, a helper method can be introduced to test whether the substrings are palindrome or not. This would be much better than testing the entire sentence is palindrome or not. Then the original recursive palindrome method would call the recursive helper method to check the entire sentence is palindrome or not. It is given below, //recursive palindrome method public boolean isPalindrome () { //calling recursive helper method return isPalindrome ( 0 , text.length() - 1 ); } In the above, the method call is not recursive. The “isPalindrome(String)” method calls the helper method “isPalindrome(String, int, int)”.

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Chapter 13.2, Problem 7SC

Program Plan Intro

Recursive helper method:

The recursive helper method is used to identify how far the recursion has already proceeded or how far it still has to proceed.

A task may often be solved by handing it over to a recursive helper method.

The recursive helper method can be defined by slightly changing the original recursive method.

Example for recursive helper method:

Consider the method “public boolean isPalindrome(int start, int end)” used to check a sentence is palindrome or not. Sometimes this method is inefficient for constructing the new sentences.

So, a helper method can be introduced to test whether the substrings are palindrome or not. This would be much better than testing the entire sentence is palindrome or not.

Then the original recursive palindrome method would call the recursive helper method to check the entire sentence is palindrome or not. It is given below,

//recursive palindrome method

public boolean isPalindrome()

{

//calling recursive helper method

return isPalindrome(0, text.length() - 1);

}

In the above, the method call is not recursive. The “isPalindrome(String)” method calls the helper method “isPalindrome(String, int, int)”.

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