Chapter 9. The Iterator and Composite Patterns: Well-Managed Collections

image with no caption

There are lots of ways to stuff objects into a collection. Put them into an Array, a Stack, a List, a Hashmap, take your pick. Each has its own advantages and tradeoffs. But at some point your client is going to want to iterate over those objects, and when he does, are you going to show him your implementation? We certainly hope not! That just wouldn’t be professional. Well, you don’t have to risk your career; you’re going to see how you can allow your clients to iterate through your objects without ever getting a peek at how you store your objects. You’re also going to learn how to create some super collections of objects that can leap over some impressive data structures in a single bound. And if that’s not enough, you’re also going to learn a thing or two about object responsibility.

Breaking News: Objectville Diner and Objectville Pancake House Merge

That’s great news! Now we can get those delicious pancake breakfasts at the Pancake House and those yummy lunches at the Diner all in one place. But, there seems to be a slight problem...

image with no caption

Check out the Menu Items

At least Lou and Mel agree on the implementation of the MenuItems. Let’s check out the items on each menu, and also take a look at the implementation.

Lou ...

Get Head First Design Patterns now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.