[java] Printing reverse of any String without using any predefined function?

ReverseString.java

public class ReverseString {
    public static void main(String[] args) {
        String str = "Ranga Reddy";
        String revStr = reverseStr(str);
        System.out.println(revStr);     
    }

    // Way1 - Recursive
    public static String reverseStr(String str) {
        char arrStr[] = reverseString(0, str.toCharArray());
        return new String(arrStr);
    }

    private static char[] reverseString(int charIndex, char[] arr) {     
        if (charIndex > arr.length - (charIndex+1)) {
          return arr;
        }

        int startIndex = charIndex;
        int endIndex = arr.length - (charIndex+1);

        char temp = arr[startIndex];        
        arr[startIndex] = arr[endIndex];
        arr[endIndex] = temp;      
        charIndex++;       
        return reverseString(charIndex++, arr);
    }

    // Way2
    private static String strReverse(String str) {
        char ch[] = new char[str.length()];
        for (int i = str.length() - 1, j = 0; i >= 0; i--) {
            ch[j++] = str.charAt(i);
        }
        return new String(ch);
    }
}