create palindrome function in Java

[mramachandran]

Certainly! Here is a detailed function description for a developer to create a palindrome checker function in Java:

Function Description: isPalindrome

Objective:

The objective of this function is to determine if a given string is a palindrome. A palindrome is a string that reads the same backward as forward.

Function Signature:

public static boolean isPalindrome(String str)

Parameters:

• str: A String input that needs to be checked for the palindrome property.
  • Type: String
  • Constraints: The string may contain alphanumeric characters and may include spaces. The function should be case-insensitive and ignore non-alphanumeric characters.

Return Value:

• boolean: Returns true if the input string is a palindrome, false otherwise.

Steps to Implement:

1. Normalize the Input:

   • Convert the string to lower case to make the check case-insensitive.
   • Remove all non-alphanumeric characters from the string.

2. Initialize Pointers:

   • Use two pointers: one starting at the beginning of the string (left) and the other at the end of the string (right).

3. Check Characters from Both Ends:

   • Iterate over the string using the two pointers.
   • Compare characters at the left and right pointers.
   • If the characters are the same, move the pointers towards the center.
   • If the characters are different, return false.

4. Return Result:

   • If all characters match, return true.

Edge Cases:

• An empty string or a string with one character should return true since they are trivially palindromes.
• Strings with spaces and punctuation should be properly normalized to avoid false negatives.

[mramachandran]

• create a branch like "mrb/palindrome" and then start your work. Look at "Development" link on the right side

[GamerMRB]

finished

[GamerMRB]

The code is efficient to the point where it determined that "Edna Waterfall" by Howard W. Bergerson was a palindrome. This poem, 1,039 words, is the longest palindrome poem in the world!