How to Instantiate a Dependency in Memory

It's really difficult to understand what a code behind page does, and to learn what it does. If the business logic has a dependency on this data database module, then that dependency has to be made very clear,. It's very transparent. Let's say in that business logic module, the constructor instantiates a database access class, a DAO object. Now you can't really tell from the outside of that object that that's what's going on. Right? Yep. Those things make it harder and harder and harder to understand what that business logic does.