October 2018
Intermediate to advanced
370 pages
9h 15m
English
Content preview from Hands-On Object-Oriented Programming with Kotlin
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The is-a relationship
Before moving forward, it is very important to understand how to find a relationship between different classes. How do we know that a student can be inherited from Person or that Circle can be inherited from the Shape class? If the designed hierarchy is correct, the child class must be a type of the parent class and both classes must have an is-a relationship between them. Take a look at the following examples:
- Student is a person
- Circle is a shape
- Football player is a basketball player
- German shepherd is a dog
- Sofa is a bedroom
Most of these examples are correct but a few of them are completely false. Student is a person is correct because students have all the attributes and behaviors that a person has. Students ...
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