Reverse a string in Java

/*from   w ww  . j a va  2  s  . c o  m*/
import java.text.CharacterIterator;
import java.text.StringCharacterIterator;

public class Main {
  public static String reverse(String str) {
    if (str == null) {
      return null;
    }

    char[] newStr = new char[str.length()];
    StringCharacterIterator iterator = new StringCharacterIterator(str);
    int i = 0;

    for (char ch = iterator.last(); ch != CharacterIterator.DONE; ch = iterator
        .previous()) {
      newStr[i] = ch;
      i++;
    }

    return new String(newStr);
  }
  public static void main(String[] argv){
    System.out.println(reverse("java2s.com"));
  }
}