Object composition is a design principle in object-oriented programming that involves building complex objects by combining simpler, existing objects. Instead of inheriting behaviors and attributes from a parent class (as with inheritance), composition allows objects to incorporate functionality by consisting of other objects, often referred to as "components" or "associates." ### Key Concepts of Object Composition: 1. **Reuse of Components**: By composing objects from existing ones, developers can reuse code instead of duplicating it.
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Object composition builds behavior by storing component software objects and delegating operations to them. A containing software object can expose a distinct object interface and control which operations affect additional state. Exclusive ownership or a specified reference-aliasing discipline may be needed to protect its representation invariant. Unlike subclass overrides, object methods of a separate component do not dynamically dispatch into the containing wrapper.