Discussions

The language you're using in Greenfoot is plain old Java - you can use any Java libraries you like, code just as you would in real world Java - the conventions are the same, the syntax is the same, the language is the same. In short, pretty much all the concepts you learn in Greenfoot can be applied to "real world" situations, Java or not - and if you develop using Java (which is a highly used language in the real world, Google uses it extensively for instance) they'll translate directly. Greenfoot does make things easy from a graphical perspective and there are of course additional conc

the s is the string for the image, the 12 is font size,the next thing is text color, the last thing is background.

Thanks for your reply, it is very helpful :).

"BlueJ","Greenfoot" and "Redhat" seems to be the three sisters of a family ! haha~

Huzzah! Fixed it! It was as simple as this: It said it didn't like me accessing the non-static variable, so I changed this <Code Omitted>to this <Code Omitted> and what do you know, it worked :D.

Thanks :D.

You probably want to look at the getObjectsInRange method which will allow you to get a list of all the objects a certain radius (or closer) away from the actor.

Well if it has objects in the way that makes it a bit more complicated. You could keep track of your position by judging how much you've turned / travelled then work out from that if something you've hit is a likely edge or obstacle. That might give you a starting point. With these sorts of problems it's often easier to map out your logic on paper first, then turn it into code later.

The short answer is likely if you have to ask the question, then you're probably not at a stage where you can implement it. It is indeed impressive and a nice piece of coding, but any 3D or iso-3D like worlds you see in Greenfoot have had the 3D in them coded by hand, it's not something that's built into Greenfoot at all! Of course, this doesn't mean you can't look at the source code, try to gain an understanding of it and learn from it :)

I changed it to double and it no longer has an error, disregard this :D.

I think ill use davmac's idea. @danpost, you remember that scenario you downloaded to take a look at the code? It's that scenario.

Yeah that was it, I opened from a read-only. Thank you very much

Yes，I am. I've joined greenroom yet,but it seems only be some demos there , and I dont know how to use those cases to my class.

I have solved the question but i got a new question how can i get a signal that if the import file by scanner does not exist or the content in the file is not in correct order/format. i do not mean the immediate window will give out warnings but i want a method that will return boolean when the above error occur or not.

Thanks davmac.