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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
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Updated on: 21-Jun-2020
4K+ Views
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