Reversing a String and Checking for Palindromes

This lesson covers reversing a string and checking whether it's a palindrome in Java, so you understand the basics of string manipulation. It's for anyone searching "Java string reversal palindrome check."

StringBuilder's .reverse() reverses a string. A string that reads the same forward and backward is called a palindrome.

The example reverses a string with new StringBuilder(s).reverse().toString() inside an isPalindrome() method, then compares it to the original string s with .equals(). "racecar" reads the same backward, so it's correctly identified as a palindrome.

A common early mistake is not knowing Java's String has no direct .reverse() method of its own. You need to convert it to a StringBuilder to reverse it — something that trips people up if they don't already know it.

It's a classic exercise for practicing how to think about string manipulation in general.