I think constant means it can't be changed from anywhere. To achieve this, use the 'final' keyword. If the cellsize should be what the cellsize of a world is, then you can do this: Then you can access this variable from everywhere with 'Gound.CELL_SIZE'. Is that what you want or do you only want lines on the background without actually have these cells? Then I would suggest to create one of those cells and set it as the background. I did that in my Tetris4D game. I created a grey rectangle and draw a white rectangle, which is a bit smaller than the other, above it. Then I set this as the background and the whole world is filled with these cells. If you have a background image which shouldn't repeat every cell, then you could use a for-loop to create all the lines.

@Super_Hippo -- no. As 'static', the field is no longer bound to an object, but to the class. In other words, it is no longer an instance field. As defined here, it is an instance field that cannot be changed -- hence, an instance constant. I also made it private, so other classes or objects cannot directly access the value of the field (the requirement was to pass it to the objects that needed it). Another requirement was to 'draw' the lines on the world, which probably means that Actor objects are not involved in producing them.

The reason why I made it 'static' was that it can be used in the creating of the world. If the variable CELL_SIZE has nothing to do with the cell size in the world constructor, I pointed out (or let's say I tried) what to do then in the last paragraph.

Probably would have been better to let CKnox try with a final int first then let him answere the question if he gets an error himself right? I was told not to make it static if you can prevent it :/...

You can't use a non-static int when creating your start world, that's why I suggested making in static. But if the actual world cell size stays at 1 (or whatever it was before), then this isn't needed anyway.

Update: When I tried Super_Hippo's suggestion it onoly made the world bigger, but didn't create the visible cells. And when I tried danpost's suggestion it didn't compile, it had an error saying it cannot reference Cell_Size before the supertype constructor is called. There also seems to be confusion about what I'm trying to do, which is basically something similar to snake. So the cells I'm trying to make are supposed to be similar to like in a snake game.

I do not think you were coding my way properly. My suggestion was this:

I couldn't get the image to show what it is but this link ( http://www.pembinatrails.ca/fortrichmondcollegiate/compsci/greenfoot/worm/default.htm ) is the project I'm trying to do. The cells are supposed to look like that but they aren't showing. I was able to get the Food and Worm images but not the cells.

You need to draw the lines on the world background to produce the edges of the cells (horizontal and vertical lines gapped by the value of CELL_SIZE pixels). The default background image of the world has a default drawing color of WHITE, so it will need to be changed before drawing the lines.