聚合，组合和依赖关系有什么区别？ [英] What is the difference between aggregation, composition and dependency?

问题描述

解决方案

聚合意味着关系孩子可以独立于父母存在。示例：Class（parent）和Student（child）。删除课程，学生仍然存在。

组合意味着小孩不能独立于父母的关系。示例：House（parent）和Room（child）。

上述两种是包含（因此是父子关系）的形式。 p>

依赖关系是一种较弱的关系形式，代码术语表示一个类使用另一个参数或返回类型。

依赖关系是一种关联的形式。

What is the difference between aggregation, composition and dependency?

解决方案

Aggregation implies a relationship where the child can exist independently of the parent. Example: Class (parent) and Student (child). Delete the Class and the Students still exist.

Composition implies a relationship where the child cannot exist independent of the parent. Example: House (parent) and Room (child). Rooms don't exist separate to a House.

The above two are forms of containment (hence the parent-child relationships).

Dependency is a weaker form of relationship and in code terms indicates that a class uses another by parameter or return type.

Dependency is a form of association.

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