When to use composition vs inheritance

In Java 101: Inheritance in Java, Part 1, you learned how to leverage inheritance for code reuse, by establishing is-a relationships between classes. Composition is a closely related programming technique that is used to establish has-a relationships instead. Whereas inheritance extends the features of one class to another, composition allows us to compose one class from another class. The distinction is subtle at first, but it will make more sense once you see it in code.

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