"Luckily for us, to use a normal distribution of random numbers in a Processing sketch, we don’t have to do any of these calculations ourselves. Instead, we can make use of a class known as Random, which we get for free as part of the default Java libraries imported into Processing"
I found this to be not the case in Processing 3.0 (Mac), where you have to manually import java.util.* library before using the Random class:
Chapter 1.4 states:
I found this to be not the case in Processing 3.0 (Mac), where you have to manually import java.util.* library before using the Random class:
import java.util.*;