Composition
Composition is a stronger form of aggregation where the part (child) cannot exist without the whole (parent). For example, a “House” object may be composed of “Room” objects, and if the house is destroyed, the rooms are also destroyed.
What are the Relationships among Objects in OOAD?
In Object-Oriented Analysis and Design (OOAD), the relationship among objects is fundamental to modeling the behavior and structure of a system, and Object diagrams are used to depict instances of classes and their relationships at a specific point in time. There are several types of relationships among objects:
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