How to generate a random alphanumeric string in Java?

Hello everyone! I'm writing a small application for generating passwords and temporary identifiers. I need to create random strings containing only Latin letters (a-z, A-Z) and digits (0-9). For example, something like "k3R9tB2x" or "A7fD1qP8". I tried using UUID, but it produces strings with hyphens, which I don't need. I attempted to write my own logic based on Math.random(), but the code turns out cumbersome and unreliable — sometimes it generates only letters or only digits. Here's what I came up with: ```java String generateRandomString(int length) { String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { int index = (int)(Math.random() * chars.length()); sb.append(chars.charAt(i