Java Reverse a String

Reverse.java

public static String reverse(String str) {
        return new StringBuilder(str).reverse().toString();
    }

public static String reverseString(String str) {
    char[] chars = str.toCharArray();
    String out = "";
    for(int i = chars.length - 1; i < 0; i--) {
        out += chars[i];
    }
    return out;
}