Join Barron Stone for an in-depth discussion in this video Aggregation, part of Programming Foundations: Object-Oriented Design.
- Inheritance is just one type…of relationship that can exist between objects.…The concept of aggregation is another type…of object relationship in which one object…is built of other objects.…- Like this fleet of spaceships.…We can think of a fleet as an object that contains a bunch…of individual spaceship objects.…- [Male Instructor] Aggregation is often referred to…as a has a relationship,…as opposed to the is a relationship of inheritance.…I wouldn't say that the fleet is a spaceship,…but I could say that the fleet has a spaceship.…
- Only one ship?…Well, that's a puny little fleet.…- Well, in this context,…has a can implicitly suggest has many.…So a fleet has many spaceships.…- That's more like it.…- What we're exploring here is that a has a relationship…is different from the is a relationship of inheritance.…In UML diagrams, we can represent the has a relationship…for aggregation with an unfilled diamond.…So the diagram here represents a fleet object…that contains a collection of spaceship objects.…
Spaceship refers to an abstract class,…
Barron Stone
Olivia Chiu Stone
Released
11/27/2018- Object-oriented basics: objects, classes, and more
- Encapsulation
- Inheritance
- Defining requirements
- Identifying use cases, actors, and scenarios
- Domain modeling
- Identifying class responsibilities and relationships
- Creating class diagrams
- Using abstract classes
- Working with inheritance
- Developing software with object-oriented design principles
Skill Level Beginner
Duration
Views
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Introduction
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What you should know1m 33s
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1. Object-Oriented Fundamentals
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Object-oriented thinking4m 23s
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Objects5m 1s
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Classes4m 38s
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Abstraction2m 32s
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Encapsulation3m 38s
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Inheritance4m
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Polymorphism4m 9s
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2. Requirements
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Defining requirements5m 9s
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FURPS+ requirements2m 37s
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3. Use Cases and User Stories
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Use cases4m 57s
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Identifying the actors3m 39s
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Identifying the scenarios4m 18s
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Diagramming use cases3m 38s
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User stories3m 53s
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Challenge: Jukebox use cases1m 11s
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Solution: Jukebox use cases2m 44s
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4. Domain Modeling
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Identifying the objects3m 52s
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CRC cards2m 58s
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5. Class Diagrams
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Instantiating classes3m 39s
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6. Inheritance and Composition
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Using inheritance2m 44s
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Interfaces4m 15s
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Aggregation2m 3s
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Composition1m 45s
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7. Software Development
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Software testing3m 38s
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Design patterns3m 48s
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Conclusion
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Next steps50s
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Video: Aggregation