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Generating OTP in Java
Generate OTP is now a requirement on most of the website now-a-days. In case of additional authentication, system generates a OTP password adhering to OTP policy of the company. Following example generates a unique OTP adhering to following conditions −
- It should contain at least one number.
- Length should be 4 characters.
Example
import java.util.Random; public class Tester { public static void main(String[] args) { System.out.println(generateOTP(4)); } private static char[] generateOTP(int length) { String numbers = "1234567890"; Random random = new Random(); char[] otp = new char[length]; for(int i = 0; i< length ; i++) { otp[i] = numbers.charAt(random.nextInt(numbers.length())); } return otp; } }
Output
6674
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