How to reverse a string in Java without using String.reverse()

public class Main{
    public static String reverse(String input) {
        if (input == null) return null;
        StringBuilder output = new StringBuilder();
        for (int i = input.length() - 1; i >= 0; i--) {
            output.append(input.charAt(i));
        }
        return output.toString();
    }
    public static void main(String[] args){
        String text = "educative";
        System.out.println("Original string - " + text);
        System.out.println("Reversed string - " + reverse(text));
    }
}

public class Main{
    public static String reverse(String input) {
        char[] characters = input.toCharArray();
        int n = characters.length;
        for (int i = 0; i < n / 2; i++) {
            char c = characters[i];
            characters[i] = characters[n - i - 1];
            characters[n - i - 1] = c;
        }
        return new String(characters);
    }
    public static void main(String[] args){
        String text = "educative";
        System.out.println("Original string - " + text);
        System.out.println("Reversed string - " + reverse(text));
    }
}