The reserved word, extends, is used to denote a has-a relationship.

Name: The reserved word, extends, is used to denote a has-a relationship.
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The reserved word extends is used to denote an is-a relationship in object-oriented programming, indicating that a subclass is inheriting traits and behaviors from a parent class. A has-a relationship is denoted by composition or aggregation, where an object of one class has a reference to an object of another class.

The Reserved Word, Extends, Is Used to Denote a Has-A