ChallengeNine.java

package com.bmchild.challenge.nine;

public class ChallengeNine {

	private static final String PALINDROME = "Mr. Owl ate my metal worm";
	private static final String NOT_PALINDROME = "I am not a palindrome.";
	
	public static void main(String[] args) {
		checkPalindrome(PALINDROME);
		checkPalindrome(NOT_PALINDROME);
		for(int i = 0; i< 20; i++) {
			checkPalindrome(Integer.toBinaryString(i));
		}
		
	}
	
	private static void checkPalindrome(String str) {
		String stripped = stripChars(str);
		String reversed = reverseChars(stripped);
		
		if(reversed.equals(stripped)) {
			System.out.println("'" + str + "' IS a palindrome");
		} else {
			System.out.println("'" + str + "' is NOT a palindrome");
		}
	}

	private static String reverseChars(String stripped) {
		return new StringBuilder(stripped).reverse().toString();
	}

	private static String stripChars(String palindrome2) {
		return palindrome2.replaceAll("[\\W]", "").toLowerCase();
	}
}

/* output is 
'Mr. Owl ate my metal worm' IS a palindrome
'I am not a palindrome.' is NOT a palindrome
'0' IS a palindrome
'1' IS a palindrome
'10' is NOT a palindrome
'11' IS a palindrome
'100' is NOT a palindrome
'101' IS a palindrome
'110' is NOT a palindrome
'111' IS a palindrome
'1000' is NOT a palindrome
'1001' IS a palindrome
'1010' is NOT a palindrome
'1011' is NOT a palindrome
'1100' is NOT a palindrome
'1101' is NOT a palindrome
'1110' is NOT a palindrome
'1111' IS a palindrome
'10000' is NOT a palindrome
'10001' IS a palindrome
'10010' is NOT a palindrome
'10011' is NOT a palindrome
*/