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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.
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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.
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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.
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In this case, the only you can do is to ask for assistance of a professional staff.2 Greenfoot Ontwikkelomgeving gebaseerd op de Java programmeertaal. If the problem with the GREENFOOT file has not been solved, it may be due to the fact that in this case there is also another rare problem with the GREENFOOT file.
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If you are sure that all of these reasons do not exist in your case (or have already been eliminated), the GREENFOOT file should operate with your programs without any problem.
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Drivers of equipment used by the computer to open a GREENFOOT file are out of date.The computer does not have enough hardware resources to cope with the opening of the GREENFOOT file.The GREENFOOT file which is being opened is infected with an undesirable malware.Incomplete installation of an application that supports the GREENFOOT format.Accidental deletion of the description of the GREENFOOT from the Windows registry.Incorrect links to the GREENFOOT file in registry entries.Corruption of a GREENFOOT file which is being opened.There may be other problems that also block our ability to operate the Greenfoot Project file.
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The inability to open and operate the GREENFOOT file does not necessarily mean that you do not have an appropriate software installed on your computer. Possible problems with the GREENFOOT format files