Check if String Palindrome

We can check palindrome string by reversing string and checking whether it is equal to the original string or not.

checkIfPalindrome(String s)
{

StringBuilder s2 = new StringBuilder(s);
s2.reverse();

String rev_s2 = s2.toString();

if(s.equals(rev_s2))
{ return true; }
else
{ return false; }


}

(OR)

public class Palindrome {
public static void main(String[] args) {
String str = "OOLOO";
StringBuffer newStr =new StringBuffer();
for(int i = str.length()-1; i >= 0 ; i--) {
newStr = newStr.append(str.charAt(i));
}
if(str.equalsIgnoreCase(newStr.toString())) {
System.out.println("String is palindrome");
} else {
System.out.println("String is not palindrome");
}
}

}