java check palindrome with string builder

1public static boolean isPalindrome(String str){  
2    StringBuilder sb=new StringBuilder(str);  
3    sb.reverse();  
4    String rev=sb.toString();  
5    if(str.equals(rev)){  
6        return true;  
7    }else{  
8        return false;  
9    }  
10}  

1//This function generates a palindrom by recursively reversing a String,
2//recursively add it and checks if it's a palindrom
3
4public static String generatePalindrom(String s) {
5	return s.equals(reverseString(s)) ? s
6				: generatePalindrom(String.valueOf(Integer.parseInt(s) + Integer.parseInt(reverseString(s))));
7}
8
9public static String reverseString(String s) {
10	return s.length() == 1 ? s : s.charAt(s.length() - 1) + reverseString(s.substring(0, s.length() - 1));
11}