java - Assured 6 digit random number

Question

I have to Generate a 6 digit Random Number. The below is the Code that I have done so far. It works fine but some time its giving 7 digits in place of 6 digits.

The main question is why?

How do I generate an assured 6 digit random number?

val ran = new Random()
val code= (100000 + ran.nextInt(999999)).toString

Answer 1

If ran.nextInt() returns a number larger than 900000, then the sum will be a 7 digit number.

The fix is to make sure this does not happen. Since Random.nextInt(n) returns a number that is less than n, the following will work.

val code= (100000 + ran.nextInt(900000)).toString()