Please help me on this palindrome program

Question

import java.io.*;
public class lab16b2
public static void main (String args[]) throws IOException
          BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
          boolean finished = false;
          clearScreen(31);
          do
               System.out.print("Enter a string  ===>>  ");
               Palindrome p = new Palindrome(input.readLine());       
               p.displayData();
               System.out.print("\nDo you wish to repeat this program [Y/N]?  ===>>  ");
               String repeat=input.readLine();
                boolean right=(repeat.equals("Y") || repeat.equals("yes")||repeat.equals("y")||repeat.equals("YES"));
                if (right)
                  System.out.println();
               else
               System.out.println();
                  finished = true;
          while (!finished);
     public static void clearScreen(int numberoflines)
            for(int i=0;i<numberoflines;i++)
                 System.out.println();
class Palindrome
   private String s1;          // stores original string entered at the keyboard
   private String s2;          // stores s1 with punctuation and spaces removed
   private boolean palindrome;
   private boolean almostPalindrome;
   private boolean isPal(String s)
        System.out.println("String:" + s1);
   s2=s1.toLowerCase();               
   int a=0;
    int b=s2.length()-1;
    while (a<b)
      if(s2.charAt(a) != s2.charAt(b))
        return false;
      a++;
      b--;
    return true;           
   private boolean isAlmostPal()
        s2=s1.toLowerCase();
   s2=s2.replaceAll("[^a-zA-Z0-9]+", "");     
    int a=0;
    int b=s2.length()-1;
    while (a<b)
      if(s2.charAt(a) != s2.charAt(b))
        return false;
      a++;
      b--;
   return true;
   public void checkData()
       if(isPal(s1)==true)
            almostPalindrome=false;
       else
     almostPalindrome=true;
   public Palindrome(String s)
        s1=s;
        s2="";
   public void displayData()
         if (isPal(s2))
      System.out.println("Palindrome: true");
    else
      System.out.println("Palindrome: false");
    if(isAlmostPal())
      System.out.println("Almost Palindrome: true");
    else
      System.out.println("Almost Palindrome: false");
The output is supposed to be:
Enter a string ===>> Racecar
String: Racecar
Palindrome: true
Almost Palindrome: false
Do you wish to repeat this program [Y/N]? ===>> y
Enter a string ===>> Aardvark
String: Aardvark
Palindrome: false
Almost Palindrome: false
Do you wish to repeat this program [Y/N]? ===>> y
Enter a string ===>> A man, a plan, a canal, Panama
String: A man, a plan, a canal, Panama
Palindrome: false
Almost Palindrome: true
Do you wish to repeat this program [Y/N]? ===>> n
While on the other hand, my output is:
Enter a string ===>> Racecar
String: Racecar
Palindrome: true
Almost Palindrome: true<--SUPPOSED TO BE FALSE
Do you wish to repeat this program [Y/N]? ===>> y
Enter a string ===>> Aardvark
String: Aardvark
Palindrome: false
Almost Palindrome: false
Do you wish to repeat this program [Y/N]? ===>> y
Enter a string ===>> A man, a plan, a canal, Panama
String: A man, a plan, a canal, Panama
Palindrome: false
Almost Palindrome: true
Do you wish to repeat this program [Y/N]? ===>> n
I don't know how to change it without altering the other palindromes. Help will be greatly appreciated!

Answer 1

Try this:
import java.io.*;
public class lab16b2 {
   public static void main (String args[]) throws IOException {  
      BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
      boolean finished = false;
      clearScreen(31);
      boolean right;
      do {
         System.out.print("Enter a string  ===>>  ");
         Palindrome p = new Palindrome(input.readLine());       
         p.displayData();
         System.out.print("\nDo you wish to repeat this program [Y/N]?  ===>>  ");
         String repeat = input.readLine();
         right = (repeat.equals("Y") || repeat.equals("yes")
               ||repeat.equals("y")||repeat.equals("YES"));
         System.out.println();
      } while(right);
   public static void clearScreen(int num) {
      for(int i=0; i < num; i++) System.out.println();
class Palindrome {
   private String data;
   public Palindrome(String s) {
          data = s;
      /** Returns true iff s is a palindrome. */
   private static boolean isPal(String s) {
      int a = 0;
      int b = s.length() - 1;
      while(a < b) {
         if(s.charAt(a) != s.charAt(b)) return false;
         a++;
         b--;
      return true;           
   public boolean isPalindrome() {
        return isPal(data.toLowerCase());
   public boolean isAlmostPal() {
      String toTest = data.toLowerCase().replaceAll("[^a-zA-Z0-9]+", "");
      return !isPalindrome() && isPal(toTest);
   public void displayData() {
      System.out.println("Palindrome: " + isPalindrome());
      System.out.println("Almost Palindrome: " + isAlmostPal());
}