Random float

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

examples/groovy/random_float.gvy

println(Math.random())

Random integers

examples/groovy/random_integers.gvy

Random rnd = new Random()
println(rnd.next(2)) // 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.

examples/groovy/random_selection.gvy

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

for (i=0; i < 10; i++) {
   println(z[rnd.nextInt(z.size)])
}