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"?单项选择题
A
Subject
B
Teacher
C
University
D
Keyword

Question

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"?

BlackTom AI · Accepted Answer

The question asks: 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"?

Option 1: Subject
- Rationale: Keywords are attributes that describe a subject. The operation to update those keywords logically belongs to the Subject class, since it directly manages data about a specific subject. This reflects good design where the class encapsulates its own data and behaviors related to that data.

Option 2: Teacher
- Rationale: While teachers may have permission to modify a subject's keywords in a real system, the operation is not inherently a behavior of the Teacher class. The responsibility to manage subject metadata (like keywords) typically lies with the Subject or a domain service, not with the Teacher entity itself. Assigning updateKeywords to Teacher would blur class responsibilities.

Option 3: University
- Rationale: The University class would represent the whole institution and typically oversees many subjects. An updateKeywords operation at this level would be too broad and would not target a specific subject’s metadata. It would be awkward to apply a per-subject update at the university level.

Option 4: Keyword
- Rationale: A Keyword by itself represents a keyword value or token, not an entity that owns the operation to update keywords. It would be unusual for a Keyword class to have an updateKeywords operation, since keywords are the data rather than the container or manager of that data.

In summary, the operation that updates subject-specific keywords most naturally belongs to the Subject class, as it encapsulates the data (keywords) described by that subject and is the appropriate place to modify its own metadata.

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"?单项选择题

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