OTP Creater

otp.java

// Java code to explain how to generate OTP

// Here we are using random() method of util
// class in Java
import java.util.*;

public class otp
{
	static char[] OTP(int len)
	{
		System.out.println("Generating OTP using random() : ");
		System.out.print("You OTP is : ");

		// Using numeric values
		String numbers = "0123456789";

		// Using random method
		Random rndm_method = new Random();

		char[] otp = new char[len];

		for (int i = 0; i < len; i++)
		{
			// Use of charAt() method : to get character value
			// Use of nextInt() as it is scanning the value as int
			otp[i] =
			numbers.charAt(rndm_method.nextInt(numbers.length()));
		}
		return otp;
	}
	public static void main(String[] args)
	{
		int length = 4;
		System.out.println(OTP(length));
	}
}