Now you have the objects reference which has the right type and you call the method nextLevel(). The sources in that are for Greenfoot versions 3.6.X and 3.7.X. Ive created a sorted collection of all the files you need. The Greenfoot sources are available on the Greenfoot website, but its quite complicated to order the files in the folder you get, and also some files are missing. So i checked the onGround method in the window and it said. In the onGround method it is to detect if the Actor is touching Ground.class but when I compile the code and run the game the character falls through the Ground.class. The part ((CrabWorld) getWorld()) casts the returned world to a CrabWorld (because of the brakets it's casted before the method is called. For Greenfoot, you also need to download the source code. this is my actor class, when it touches Ground.class it is to stop falling, hence the CheckFall method.

Now because your world is a CrabWorld you can cast the World object that is returned from getWorld() to a CrabWorld and so you have the reference with the right type and you now can call the method nextLevel(). That method only exists in the CrabWorld method. But getWorld() returns an object from type greenfoot.World and in the class greenfoot.World there is no method nextLevel. In your case the reference is getWorld(). This static methds can be called with just the classname + the method name (like CrabWorld.nextLevel() ).Ī non static method has to be called throu the reference to the object.Ī static method doesn't need a reference because a static method or field is the same for all classes and doesn't change anything of the object.Ī non static method call has to be connected with the object you want to call this method for (the reference). * Create the objects for the start of the game.ĪddObject(new Worm(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber(560)) ĪddObject(new Lobster(), Greenfoot.getRandomNumber(560), Greenfoot.getRandomNumber(560)) Ī static method is not declared public void but public static void (or private or anything else). * of 560x560 cells, where every cell is just 1 pixel. public static final Color pathColor = new Color(227, 202, 148) Import greenfoot.* // imports Actor, World, Greenfoot, GreenfootImage * Check whether we have stumbled upon a worm. * Check whether a control key on the keyboard has been pressed. Image2 = new GreenfootImage('crab2.png') * the 'Act' or 'Run' button gets pressed in the environment. * Act - do whatever the crab wants to do. * In this version, the crab behaves as before, but we add animation of the * (very yummy, especially the green ones). Import greenfoot.* // (World, Actor, GreenfootImage, and Greenfoot)

Sound to character in greenfoot