课程: Programming Foundations: Design Patterns

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Creating chaos with inheritance

Creating chaos with inheritance

课程: Programming Foundations: Design Patterns

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Creating chaos with inheritance

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- We're now going to explore a pattern called the decorator pattern, and to get a better understanding for this pattern we're going to start with a small example. Let's say you want to build an order system for a small coffee shop, one which serves and takes payments for beverages. The shop has four main types of beverages on the menu, each of which has a description and a cost. And to each beverage you can add a number of condiments like soy or milk or whip or mocha. Each of these condiments has a small cost which needs to be added to the cost of the coffee. Let's sketch out a design for the coffee shop's order system. We'll start with a beverage superclass which has a description field and a corresponding getter method as well as a cost method. Now let's add some subclasses like house blend, dark roast, decaf, and espresso. Note that each coffee is a beverage. In other words, we have an is-a relationship between the…

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