Question

How to generate 20 digits random numbers in Java

Answer 1

import java.util.Random;

public class Generate20DigitsRandomNumbers_Java {
    public static void main(String[] args) {
        Random rand = new Random();

        for (int count = 0; count < 25; count++) {
            StringBuilder s = new StringBuilder();
            for (int i = 0; i < 20; i++) {
                s.append(rand.nextInt(9) + 1);
            }
            try {
                java.math.BigDecimal dec = new java.math.BigDecimal(s.toString());
                System.out.println(dec);
            } catch (NumberFormatException e) {
                System.out.println("exception: " + e);  
            }
        }
    }
}



 
/*
run:

84756574421792496783
14413788463847238822
42643985739565789833
18547339634665986843
71249211821483617439
14231555824476978229
72768997121796812384
82293487999459484569
36142184665684879268
77688271513875197266
46248955529647868678
41914289548467252987
45247314526415885761
43926765773331618771
16294368381956847726
76398221862221526816
27794464424131433699
24275849315595362583
76143642589217755366
94533555682479967968
69215592464143484436
86169651644185416952
35182447219231878463
74996854642568267719
45157276529775289879
 
*/

 

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