Reverse String [for & recursive]

RecursiveStringReverse.java

public class Main {

    public static void main(String[] args) throws Exception {
        System.out.println(reverse("0123456789"));
    }

    private static String reverse(String str) {
        int size;
        if((str == null) || (size = str.length()) == 0) {
            return str;
        } else if(size == 1) {
            return str;
        }
        return new String(swap(str.toCharArray(), 0, size-1));
    }

    private static char[] swap(char[] str, int i, int j) {
        char c = str[i];
        str[i] = str[j];
        str[j] = c;
        return (i < j)? swap(str, ++i, --j) : str;
    }

}

StringReverse

public class Main {

    public static void main(String[] args) throws Exception {
        System.out.println(reverse("0123456789"));
    }

    private static String reverse(String str) {
        int size;

        if((str == null) || (size = str.length()) == 0) {
            return str;
        } else if(size == 1) {
            return str;
        }

        char[] _str = str.toCharArray();
        char c;
        for(int i = 0, j = size-1; i < j; i++, j--) {
            c = _str[i];
            _str[i] = _str[j];
            _str[j] = c;
        }

        return new String(_str);
    }

}