June 2018
Intermediate to advanced
280 pages
7h 46m
English
Content preview from Design Patterns and Best Practices in Java
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Composition
As the name suggests, a class is a composition of another one. This is somewhat similar to aggregation, with the difference being that the dependent class ceases to exist when the main class ceases to exist. For example, a House is made up of a Room, but the Room ceases to exist if the House is destroyed, as shown in the following diagram:
In practice, especially in languages such as Java that have garbage collectors, the boundary between composition and aggregation is not so well defined. Objects are not destroyed manually; when they are no longer referenced, they are automatically destroyed by the garbage collector. For this ...
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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.