In order to generate pseudo-random numbers in Groovy, we can use the Math.random() method or the Random class provided by Java.

Random float

The random method will generate a floating point number between 0 and 1. (0 included 1 excluded).



Random integers


Random rnd = new Random()
println( // 2 bits of random number that is, one of the following: 0,1,2,3
println(rnd.nextInt(3)) // random integer in the range of 0, 3  (so one of 0,1, 2)

In the next example we have a list of one-letter strings and we would like to pick one of the elements randomly. So we need an integer between 0 and the size of the array.

We run it in a loop so we can see more values picked.


def z = ["a", "b", "c", "d", "e"]
Random rnd = new Random()

for (i=0; i < 10; i++) {