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
When an object contains another object in its body, the relationship between them is called aggregation. This is a loosely-coupled relationship between two objects, in which one object is not completely dependent on the other. Take a look at the following examples:
- A room has a chair
- A garden has a plant
- A dog has a master
This relationship is called a has-a relationship because one object has another object. We cannot say that the plant is a garden, but we can say that the garden has a plant. An object can have a relationship with more than one object:
- A garden has many plants
- A company has employees
- A room has chairs
In this relationship, both objects are loosely coupled. This means that if one object is removed from the ...
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