How to generate a 14 digit positive number?

Question

Java

How to generate a 14 digit positive number?

Answer 1

If you need long ones (let's say 100-digit ones), then it can be costly like this (example for 14-digit ones):

BigInteger b;
do{
       b = new BigInteger(48, new SecureRandom());
} while (b.toString().length()!=14);
System.out.println(b.toString());

Answer 2

thank. both options are good.

Answer 3

Here's another option:

ThreadLocalRandom.current().nextLong(10000000000000L, 100000000000000L);