Does this bit of code violate what it means to be a stack?

        StringBuilder sb = new StringBuilder(); // Create a StringBuilder to build the result string
        for (char c : stack) { // Iterate through the characters in the stack
            sb.append(c); // Append each character to the StringBuilder
        }
        return sb.toString(); // Convert the StringBuilder to a string and return the result

As it is iterating from bottom to top, it's no longer LIFO.