In “Java 101: Inheritance in Java, Part 1,” you learned how to leverage inheritance for code reuse, by establishing is-a relationships between classes. This free Java 101 primer focuses on composition, 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 a class from another class. The distinction may seem subtle, but it will make more sense once you see it in code.
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