JAVA Program to generate OTP

Otp.java

package java8s;

import java.util.Random;

public class Otp {

     static char[] sendOtp(int length){

          System.out.println("your otp for this transaction is:");

          String numbers="0123456789";

          Random r=new Random();

          char[] otp=new char[length];

         

          for(int i=0;i<length;i++)

          {

              otp[i]=numbers.charAt(r.nextInt(numbers.length()));

          }

          return otp;

     }

    

    

     public static void main(String[] args) {

         

          System.out.println("generating otp....");

          System.out.println(sendOtp(4));

     }

}

Output 

generating otp....

your otp for this transaction is:

7176