[ Select ]
Composition
Aggregation
refers to if the whole is deleted, all parts are deleted while
[ Select ]
Aggregation
Composition
provides a means of showing that the whole object is composed of the sum of its parts (other objects).

Question

[ Select ]
Composition
Aggregation
 refers to if the whole is deleted, all parts are deleted while 
[ Select ]
Aggregation
Composition
 provides a means of showing that the whole object is composed of the sum of its parts (other objects).

BlackTom AI · Accepted Answer

The question presents two fill-in-the-blank statements about two concepts, and the provided answers indicate the first blank should be filled with Composition and the second with Aggregation.
First statement: "[Select] Composition refers to if the whole is deleted, all parts are deleted..." In object-oriented design and UML terminology, composition is the strong form of a whole/part relationship where parts are tightly bound to the whole; when the whole is destroyed, its parts are typically destroyed as well. This reflects a lifecycle dependency: the parts do not have an independent existence outside the whole. Therefore, filling the blank with Composition correctly captures this dependency.
Second statement: "[Select] Aggregation provides a means of showing that the whole object is composed of the sum of its parts (other objects)." Aggregation is described as a weaker whole/part relationship, where the parts can exist independently and the whole simply aggregates them. The phrasing here emphasizes that the whole is shown to be composed of parts; while this description could be compatible with both terms in casual language, in the context of the two options and the given answers, Aggregation is the intended term for indicating a collection of parts that collectively form the whole without implying a strict lifecycle dependency. Thus, selecting Aggregation for this blank aligns with the notion of a whole object being described as a sum or collection of its constituent parts, without asserting the strong dependency implied by composition.
To further contrast, consider potential misconceptions: if one thought the second statement referred to a stronger bond, they might choose Composition again, but the wording explicitly positions Aggregation as the mechanism for showing a whole composed of parts in a looser sense. Conversely, choosing a different term would contradict the standard definitions of composition (strong lifecycle dependency) and aggregation (weaker, part-whole relation).
In summary, the first blank correctly uses Composition to denote the lifecycle-dependent whole-part relationship, while the second blank correctly uses Aggregation to denote the idea of the whole being described as a collection or sum of its parts without implying strict dependency.

[ Select ] Composition Aggregation refers to if the whole is deleted, all parts are deleted while [ Select ] Aggregation Composition provides a means of showing that the whole object is composed of the sum of its parts (other objects). 多重下拉选择题

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[ Select ] Composition Aggregation refers to if the whole is deleted, all parts are deleted while [ Select ] Aggregation Composition provides a means of showing that the whole object is composed of the sum of its parts (other objects). 多重下拉选择题

类似问题

If one of the requirements in a university system is that a teacher can update keywords of a subject, which class would get an operation "update Keywords"?

What is a limitation of the nouns & verbs method?

This is true about messages?

If one of the requirements in a university system is that a teacher can update keywords of a subject, which class would get an operation "update Keywords"?

Which of the following is an illustration of good software design principles when designing a complex Java program?

Select the right description for each of the following objects: 1: Entity ____ 2: Data access ____ 3: Control ____ 4: Boundary ____

Which methods should be defined in each class? Remember that we are assuming proper design principles, not repeating code whenever possible. 1: Drink 2: Hot Drink 3: Main 4: Snack

更多留学生实用工具

希望你的学习变得更简单

Select the right description for each of the following objects: 1: Entity 2: Data access 3: Control 4: Boundary