October 2018
Intermediate to advanced
370 pages
9h 15m
English
Content preview from Hands-On Object-Oriented Programming with Kotlin
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Aggregation, composition, and nested classes
When a class inherits another class, we often say that the child class is a kind of parent class. If a car takes the benefits of a vehicle class, for example, we say that a car is a kind of vehicle. In inheritance, classes always have an is-a relationship. In this section, we will discuss two more important topics related to object-oriented programming, in which classes have a has-a relationship instead. These concepts are aggregation and composition. Let's start by looking at aggregation.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.