Thread: Generation of Palindrome number in Java

Hi,

I am trying to write a java program to check for palindrome...but I am not getting the correct o/p...pls help me in figuring out the prob...here is the code:

public class Palindrome {
        public static void main(String args) {
        // TODO Auto-generated method stub
            String str = "candidate";
            Palindrome obj = new Palindrome();
            if(obj.isPalindrome(str))
                System.out.print(" Palindrome");
            else
                System.out.print("not Palindrome");
 
            }
 
public boolean isPalindrome(String str) {
 
          int left = 0;             // index of leftmost unchecked char
      int right = str.length() -1; // index of the rightmost
 
    while (left < right) {       // continue until they reach center
     if (str.charAt(left) != str.charAt(right)) {
      return false;       // if chars are different, finished
    }
    left++;               // move left index toward the center
    right--;             // move right index toward the center
    }
 
return true;             // if finished, all chars were same
    } 
}

public class TestforPalindrome {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Palindrome obj = new Palindrome();
        System.out.println ("mom is a palindrome? "+ obj.isPalindrome("mom"));
        System.out.println ("apple pie is a palindrome? "+ obj.isPalindrome("Apple Pie"));
        System.out.println ("poor dan is in a droop is a palindrome? "+ obj.isPalindrome("poor dan is in a droop"));
        System.out.println ("poor don is in a droop is a palindrome? "+ obj.isPalindrome("Poor Don is in a droop"));
        System.out.println ("Madam, I'm Adam is a palindrome? "+ obj.isPalindrome("madam Im adam"));
        System.out.println ("A man, a plan, a canal, Panama is a palindrome? "+ obj.isPalindrome("a man, a plan, a canal, panama"));
 
 
    }
 
}

Hello tina.goyal, welcome to the Java Programming Forums.

What is not working? I have compiled this code and it seems to be working fine.

This is the output I'm given:

mom is a palindrome? true
apple pie is a palindrome? false
poor dan is in a droop is a palindrome? false
poor don is in a droop is a palindrome? false
Madam, I'm Adam is a palindrome? false
A man, a plan, a canal, Panama is a palindrome? false

I would say this is working correctly because "mom" is a palindrome and is returning true.
madam in the phrase 'madam Im adam' is also a palindrome. If you remove the 'Im adam' bit, madam returns true.

I thought palindromes were words that can be read the same backwards. For example, nun, mom, madam..

The program works fine with single words.

Those phrases only become palindromes when they are split up differently than they are presented. I'm not sure if this qualifies them as palindromes.