Chapter 18, Problem 21PE

Program Plan Intro

Checking whether an array list is palindrome

Program plan:

Filename: “ArrayListUtil.java”

This code snippet creates a class “ArrayListUtil”. In the code,

• Import the required packages.
• Define a class “ArrayListUtil”.
  • Declare a method “isPalindrome()” to reverse the elements of array list “a”.
    • Get the length of “a” to a variable “len”.
    • Iterate a “for” loop,
      • If the condition is true,
        • Return “false”.
    • Return “true”.

Filename: “PalindromeTester.java”

This code snippet creates a class “PalindromeTester”. In the code,

• Import the required packages.
• Define a class “PalindromeTester”.
  • Define the “main” method.
    • Define an array list “a”.
    • Add elements to array list “a” by calling the method “add()”
    • Call the method “isPalindrome()” of “ArrayListUtil” on “a” and print the result.
    • Print the elements of “a”.
    • Print the expected result.
    • Define an array list “b”.
    • Add elements to array list “b” by calling the method “add()”
    • Call the method “isPalindrome()” of “ArrayListUtil” on “b” and print the result.
    • Print the elements of “b”.
    • Print the expected result.
    • Define an array list “c”.
    • Add elements to array list “c” by calling the method “add()”
    • Call the method “isPalindrome()” of “ArrayListUtil” on “c” and print the result.
    • Print the elements of “c”.
    • Print the expected result.