POODR Book Club Chapter 8

In this chapter, Metz wraps up the discussion of code arrangement with object composition. While not fit for every situation, Metz maintains that composition works well for “has-a” relationships, where an object logically contains several other objects with a role that has specific behavior.
Below are a few questions to get our conversation started around Chapter 8. Feel free to answer any one of these and reply with a helpful comment on someone else’s post as well.

1. What is the meaning of “has-a” versus “is-a” relationships in the context of inheritance and composition?
2. How might you implement the PartsFactory pattern in a different domain?
3. Any other thoughts or questions you have on this chapter?