It depends what you mean by "very limited". All the code is provided to you, so you can get through the book by simply copying and pasting the provided code snippets. As long as you understand what the code is actually doing just by reading it, you'll be okay. The book has some "challenges" where you can implement additional features if you want to, but you don't need to. However if your knowledge of Java or C is so limited that you'll have a hard time even understanding what the code is doing, then it's probably not worth the effort going through the book. It will be too confusing, and you won't learn much.