How to write complex classes?

Question

Programming

For example, you need to write a class with complex behavior. how to write it in a more optimal way?
now it turns out like this:
1) wrote a draft version, figured out what is needed, what is not needed, what is generally superfluous
2) wrote another one of the same, during the tests, I realized that such an algorithm is bad in itself.
3) has already written a final class.
Is it possible to somehow simplify the writing of complex classes?

Answer 1

It depends what you mean by complex classes. It is better to try to write simple things. Design principles to help you:
SOLID
KISS
Worse is better