GREENFOOT SNAKE MAC OS
GREENFOOT SNAKE CODE

One for the direction in the x-axis and one for the direction along the y-axis. Compile your changes, you should now see Bobby’s head at the position (2, 2).Ģ2 Beweging To know in which direction Bobby is moving, we will add two new properties. The second one uses the add() method on the snake list, allowing to add a new element (passed as input parameter) at the end of the list And the third statement, display the new element in the world at the position (2,2), thanks to the use of the addObject() method that we already used to display the borders. To be able to use the LinkedList class of Java, you also need to add at the beginning of the SnakeWorld class, the following instruction: Next, let’s add the first element in this list, in the SnakeWorld constructor The first statement creates a new SnakeBody object La première instruction crée un nouvel objet SnakeBody. Open the SnakeWorld class and add the following definition: This definition creates an empty list of SnakeBody. For that, the SnakeWorld will define a property so the list of SnakeBody will be part of its « state ». The snake in our game will be a « list » of SnakeBody. it is equivalent to the instruction x = x + 1 - The methods getWidth() and getHeight() are inherited from the World class and allow to get the width and height of the world.ġ9 De spelrand Compile your code, you should get the following screenĢ0 Klasse SnakeBody Create a new sub-class of our Block classĬall it SnakeBody et choose the image of Bobby, bobby.png All statements in Java always end with - The statement x++ allow to add 1 to the variable x.

So, the statement x = 0 allow to initialize the variable x with the value 0. We will often use this type which represents an integer number (0, 1, 2, …) - The statement variable = allow to assign the value of the expression to the variable. Next, a second loop will define a variable y, from 0 to the game height, and in this loop, we will display the blocks on the left and on the right A few additional explanations here: - Variables in Java are always typed, here the type of the variable x and y is int. In this loop, we display the blocks on the top and the bottom (note that, as we the first line index is 0, the last line index is the number of lines – 1). The syntax of a « for loop » is the following : The following schema illustrates the execution of that loop: To display the borders of our game, we will write a first loop that defines a variable x, from 0 to the width of the game. For that, we will use a very useful command, the « for loop » of Java.

GREENFOOT SNAKE CODE

To display blocks all around our screen, it would be a little tedious to write down a line of code for each block. We kunne ook zeggen dat objecten « instanties » van de klasse zijn. Een klasse is een « model » waarmee we objecten bouwen. Java applicaties bestaan uit « Objecten » Elk Object bestaat uit 2 delen: zijn eigenschappen zijn « gedrag », de acties die het object kan doenĥ Klassen en Objecten Om een object te beschrijven,definieren we een klasse.

GREENFOOT SNAKE MAC OS

Greenfoot is gratis beschikbaar voor Microsoft Windows, Mac OS X, and Linux.ģ De Java taal « Object georienteerd » taalĮén van de meest gebruikte programmeertalen te wereld Ontwikkelen van applicaties voor verschillende systemen Windows, Mac, Linux, Android, … Is gemaakt om de Java taal te leren kennen.

2 Greenfoot Ontwikkelomgeving gebaseerd op de Java programmeertaal.

Greenfoot snake