How to generate One Time Password(OTP) in Java.?

Question

You can check my code here if it need any corrections, but the code run without Error.. 👈 👈

https://code.sololearn.com/clmM38bj95TM/?ref=app

Answer 1

Your code is ok and well working. No need to ask how to generate. It's right code to generate OTP. But one suggestion generate OTP more than 4 character till 6 to 8 is ok.

Answer 2

Learn Basic Java[Follow If Not Boring] 💻 variable name should be camel Case in java. So here Number should be number.

Answer 3

zemiak Because there is no number 9 in defined String.

Answer 4

MD Torikot Rahman What wow?

Answer 5

USE THIS CODE FRAGMENT:

int otp=(int)(Math.random()*899999)+100000;

Answer 6

Thanks 🤝 man 👨

Answer 7

it is not a good practice to use the Number as a variable name because it is a standard class name.
Now your code ignores number 9 in the result.
The pseudo-random number is not really safe, but may be sufficient for this purpose.
Maybe it would be more convenient to get a String as a result,
and without output console message inside method.

Answer 8

Thanks 🤝 man 👨

Answer 9

wow

Answer 10

These are not actually one-time passwords (OTP) and can therefore not be used with, for example, Google Authenticator or similar apps. OTP's are defined in RFC 4226 (HOTP) and RFC 6238 (TOTP). I created a library, so if you want to take a look at the code: https://github.com/BastiaanJansen/OTP-Java