Exercise 8.9. Create a new program named Palindrome.java. 2. Write a method name

Question

Exercise 8.9. Create a new program named Palindrome.java. 2. Write a method named first that takes a String and returns the first letter, and one named last that returns the last letter 3. Write a method named niddle that takes a String and returns a sub- string that contains everything ercept the first and last characters 104 Chapter 8. Strings and things Hint: read the documentation of the substring method in the String class. Run a few tests to make sure you understand how substring works before you try to write niddle. What happens if you invoke niddle on a string that has only two letters? One letter? No letters 1. The usual definition of a palindrome is a word that reads the same both forward and backward, like "otto and "palindromeemordnilap. An alternative way to define a property like this is to specify a way of testing for the property. For example, we might say, "a single letter is a palindrome, and a two-letter word is a palindrome if the letters are the same, and any other word is a palindrome if the first letter is the same as the last and the middle is a palindrome. Write a recursive method named isPalindrome that takes a String and that returns a boolean indicating whether the word is a palindrome or not 5. Once you have a working palindrome checker, look for ways to simplify it by reducing the mumber of conditions you check. Hint: it might be useful to adopt the definition that the empty string is a palindrome 6. On a piece of paper, figure out a strategy for checking palindromes iteratively. There are several possible approaches, so make sure you have a solid plan before you start writing code. 7. Implement your strategy in a method called isPalindromeIter 8. Optional: Appendix B provides code for reading a list of words from a file. Read a list of words and print the palindromes

Explanation / Answer

Answer1-

Palindrome java code-

import java.util.*;

class Palindrome {
   public static void main(String args[])
   {
      String original, reverse = "";
      Scanner in = new Scanner(System.in);

      System.out.println("Enter a string to check if it is a palindrome");
      original = in.nextLine();

      int length = original.length();

      for ( int i = length - 1; i >= 0; i-- )
         reverse = reverse + original.charAt(i);

      if (original.equals(reverse))
         System.out.println("Entered string is a palindrome.");
      else
         System.out.println("Entered string is not a palindrome.");

   }
}

2.

public class Test {
   public static String first ( String original ){
       String initial = "";
       String[] split = original.split(" ");

                   initial= value.substring(0,1);
        

        return initial;
    }

    public static void main(String[] arg){
        System.out.println( first("Hoya") );
    }
}

public class Test {
   public static String last ( String original ){
       String initial = "";
       String[] split = original.split(" ");

                   initial= string.substring(string.length() - 1)
        

        return initial;
    }

    public static void main(String[] arg){
        System.out.println( last("Hoya") );
    }
}

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