Thread: How do I make this Palindrome tester ignore punctuation?

Heres the Palindrome Tester:

//import cs1.Keyboard;
 
public class PalindromeTester
{
   //-----------------------------------------------------------------
   //  Tests strings to see if they are palindromes.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      String str, another = "y";
      int left, right;
 
      while (another.equalsIgnoreCase("y")) // allows y or Y
      {
         System.out.println ("Enter a potential palindrome:");
         str = Keyboard.readString();
 
         left = 0;
         right = str.length() - 1;
 
         while (str.charAt(left) == str.charAt(right) && left < right)
         {
            left++;
            right--;
         }
 
         System.out.println();
 
         if (left < right)
            System.out.println ("That string is NOT a palindrome.");
         else
            System.out.println ("That string IS a palindrome.");
 
         System.out.println();
         System.out.print ("Test another palindrome (y/n)? ");
         another = Keyboard.readString();
      }
   }
}

How should I make this ignore punctuation?

This is a nice reference: String (Java 2 Platform SE 5.0)

To ignore cases.. There is a method just for that. To remove unwanted characters, you can do that as well Enjoy