paingifter

I realize that this question may be overlooked completely since it's ten days past the deadline for questions, however it is my hope that one of the moderators will see this and move it to the next Q&A perhaps. My question is if I were to build a base or camp with walls surrounding it, would wolves and zombies spawn inside my wall if there is a spawn point there, or would the building objects negate those spawns to preserve the usefulness of building said walls?