Thread: Java Code Challenge: Palindrome Check

Write a Java function that determines if a given string is a palindrome. The function should return true if the input string is a palindrome and false otherwise. Palindromes are strings that read the same backward as forward, ignoring spaces, punctuation, and capitalization.

For example:

public class PalindromeChecker {
    public static boolean isPalindrome(String str) {
        // Your code goes here
        return false;
    }
 
    public static void main(String[] args) {
        // Example usage:
        System.out.println(isPalindrome("A man, a plan, a canal, Panama")); // Should print true
        System.out.println(isPalindrome("Java is fun")); // Should print false
    }
}

Provide a concise and efficient Java code solution along with any explanations or considerations. Feel free to include additional test cases to showcase the robustness of your solution. Thank you!