Recursive String Reverse

ReverseString.java

public class ReverseString {

  public static void main(String[] argv) {
    String origString = argv[0];
    System.out.println(origString);
    System.out.println(reverse(origString));
  }

  public static String reverse(String str){
    char[] strAry = str.toCharArray();
    strAry = reverseAry(strAry, 0);
    
    return new String(strAry);

  }

  public static char[] reverseAry(char[] strAry, int index) {

    int oppositeIndex = strAry.length - index - 1;
    if(oppositeIndex > index) {
      char tmp = strAry[index];
      strAry[index] = strAry[oppositeIndex];
      strAry[oppositeIndex] = tmp; 
      strAry = reverseAry(strAry, ++index);
    }


    return strAry;
  }

}