Java – any website / book / technique for practicing recursion and OO design?

I just want to know if any websites have problems practicing recursion and OO design (given some entities that design class / interface structures)?

I understand that there is no difficulty in solving problems that require recursion, but I seem unable to apply recursion to a new problem Are there any techniques for applying recursion? If this question is very stupid, I apologize!

Solution

You may need to view content similar to project Euler or USACO They provide many problems from simple to hard, many of which can be solved by recursive technology As you continue, you will have the opportunity to learn how others can solve the problem you are trying In this way, you can learn not only recursion, but also many other problem-solving skills