课程: Programming Foundations: Design Patterns

Revisiting inheritance

课程: Programming Foundations: Design Patterns

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Revisiting inheritance

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- Inheritance is one of the core concepts of object-oriented design. Through inheritance, you can express class relationships that allow you to reuse and extend the behavior and properties of other classes. And code reuse is often touted as the main benefit of inheritance in object-oriented design. Typically you think of one class inheriting from another if they share an IS-A relationship. For instance, if a cat is an animal, then a cat should inherit from the animal class. We can extend this further with other types of animals. In each case, we're reusing the implementation of the classes we inherit from. This is a powerful technique, and there are many designs where inheritance is exactly the right choice. While inheritance is a core concept in object-oriented programming, it's also easy to overdo inheritance and make it the basis of all your object-oriented design. It's easy to treat inheritance as a hammer, making every design look like it needs superclasses and subclasses, in other words, your nails. So pay attention. it might be time to take a closer look at your design. Why? Because as we're going to see, when you overuse inheritance, you can end up with designs that are inflexible and difficult to change. and difficult to change.

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