If you already had to manage some degree of randomness on Java, chances are you got acquainted with the Math.random() methods. However, the previous method returns a double. Beyond very basic use-cases, another option has to be considered, in the form of the java.util.Random class. Random An instance of this class is used to generate a stream of pseudorandom numbers. — JavaDoc https://docs.oracle.com/javase/8/docs/api/java/util/Random.