String Palindrome in JAVA

Question: 

Given a string, determine if it is a palindrome, considering only alphanumeric characters.

Palindrome

A palindrome is a word, number, phrase, or other sequences of characters which read the same backwards and forwards.

 

package learningJava;

import java.util.*;

public class regPract {

/* Find the maximum and minimum element in an array

*/

public static boolean checkPalindrome(String str, String rev ) {

if(str.equals(rev)) {

return true;

}

return false;

}

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Enter String:");

String str = scan.nextLine();

String rev = "";

for(int i = str.length()-1; i >= 0 ; i-- ) {

rev = rev+str.charAt(i);

}

checkPalindrome(str,rev);

boolean isPalindrome = checkPalindrome(str, rev);

if (isPalindrome) {

System.out.println("The string is a palindrome.");

} else {

System.out.println("The string is not a palindrome.");

}

}

}