Greenfoot.getRandomNumber(20) is different from the other methods we called before, it uses the dot notation.
Means that you want Greenfoot to pick a random number for you between 0 and 19. With greenfoot the highest number possible is actually one number less than the limit and the lowest number possible is zero. When you tell someone to pick a number between 1 and 10, you are setting the limit to 10 (they will probably pick 7 by the way). The method getRandomNumber has to have a parameter that tells it how high the number can go (the limit of the number). Greenfoot can come up with a random number for us with getRandomNumber. One way to do that with Greenfoot is by using random numbers. The crab should actually go more or less in a straight line, but every now and then it should turn off course a little bit. While it walks, it goes in a straight line. Right now, the crab can walk across the screen and then turn when it hits the edge. This makes Crab a subclass of an Actor subclass called Animal. First, load the scenario Animalcrab from the handout folder.
