Java: Random

In this example we create a random speed jump by a certain constant.

private Random random = new Random();

private static final double SPEED_M_PER_S = 2.2352;  /* 5 MPH */

private static final double MAX_RANDOM_DELTA = 0.13;

double speed = SPEED_M_PER_S 

+ Math.min(MAX_RANDOM_DELTA, random.nextDouble()) 

* (random.nextBoolean() ? -1 : 1);