1. Read in the string and convert it to all lower case using toLowerCase()

2. Remove any character which is neither a letter nor a digit; you can use Character.isDigit(...) and Character.isLetter(...) to test for this. All punctuation and white space will be remove. (Hint: use replace(....) to replace any non-letter non-digit by the empty String ). (The part I'm confused of most)

3. Using charAt(...) check if the word is a palindrome by checking if each letter is the same as the letter in its mirror image position; for example Taco Cat and Toot! are palindromes:

Example : toot = palindrome

I don't know how to incorporate the punctuation array and use replace ^ help me please (this is one of the process of finishing palindrome.java)

import java.util.Scanner; public class Palindrome { /* * TODO: Complete this method as per the requirements of the assignment handout. * Make sure not to change the function signature. */ public static boolean isPalindrome( String line ) { /*We are providing you with a list of punctuations that we will use to test your code. * make sure that you use this same list of punctuations only and not something else. */ char[] punctuation = { '.', ',', ';', ':', '?', '/', '\'', '\'', '!', '-', '~', '(', ')' }; } /* * DO NOT MODIFY THE MAIN FUNCTION. * ANY CODE THAT YOU WRITE, MUST BE * INSIDE THE isPalindrome function. * Any code that you write inside the main * function will not be marked and will be completely ignored. */ public static void main(String[] args) { // Print out welcome message System.out.println(" Welcome to the Palindrome Test Program!"); // Define a scanner for user input Scanner userInput = new Scanner(System.in); System.out.println(" Type in a sentence to be tested or Control-d to end:"); while (userInput.hasNextLine()) { String line = userInput.nextLine(); if(isPalindrome( line )) System.out.println("Palindrome!"); else System.out.println("Not a palindrome!"); } System.out.println("bye!"); } }