Aggregation is a key concept in object-oriented programming that defines a 'has-a' relationship between classes, where one class (the whole) is composed of one or more classes (the parts). Unlike composition, the constituent parts in aggregation can exist independently of the whole. This relationship models real-world scenarios where an entity consists of various components that are loosely coupled. Aggregation helps in building complex systems by allowing a higher level of modularity and reuse. It is commonly used in software design to represent relationships between objects in a way that maintains their individual identities.
What is the difference between aggregation and composition?
Aggregation allows the constituent parts to exist independently of the whole, while in composition, parts cannot exist without the whole.
How does aggregation benefit software design?
Aggregation benefits software design by promoting modularity and reusability, enabling complex systems to be built from loosely coupled components.
Can you give an example of aggregation in object-oriented programming?
An example of aggregation is a university that 'has-a' relationship with departments, where each department can exist independently of the university.