How to generate a SecureRandom string of length n in Java? [duplicate]

I don’t understand why this is marked duplicate when clearly the “duplicate” question referred here doesn’t ask the same question – though an answer down below contains this information. In any case, the answer I was looking for is below, incase if it helps anyone else.

private String generateSafeToken() {
    SecureRandom random = new SecureRandom();
    byte bytes[] = new byte[20];
    random.nextBytes(bytes);
    Encoder encoder = Base64.getUrlEncoder().withoutPadding();
    String token = encoder.encodeToString(bytes);
    return token;
}