package strings;

/**
 * Reverse String using different version
 */
public class ReverseString {

 public static void main(String[] args) {
 assert reverse("abc123").equals("321cba");
 assert reverse2("abc123").equals("321cba");
 }

 /**
 * easiest way to reverses the string str and returns it
 *
 * @param str string to be reversed
 * @return reversed string
 */
 public static String reverse(String str) {
 return new StringBuilder(str).reverse().toString();
 }

 /**
 * second way to reverses the string str and returns it
 *
 * @param str string to be reversed
 * @return reversed string
 */
 public static String reverse2(String str) {

 if (str == null || str.isEmpty()) {
 return str;
 }
 
 char[] value = str.toCharArray();
 for (int i = 0, j = str.length() - 1; i < j; i++, j--) {
 char temp = value[i];
 value[i] = value[j];
 value[j] = temp;
 }
 return new String(value);
 }

}