模块与联系的度量（职责与协作的度量）：内聚与耦合

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In computer programming, cohesion refers to the degree to which the elements inside a module belong together.^[1] In one sense, it is a measure of the strength of relationship between the methods and data of a class and some unifying purpose or concept served by that class. In another sense, it is a measure of the strength of relationship between the class’s methods and data themselves.

https://en.wikipedia.org/wiki/Cohesion_(computer_science)

Coupling = interaction / relationship between two modules... Cohesion = interaction between two elements within a module.

Cohesion is an indication of the relative functional strength of a module.

Cohesion in software engineering is the degree to which the elements of a certain module belong together. Thus, it is a measure of how strongly related each piece of functionality expressed by the source code of a software module is.

Coupling in simple words, is how much one component (again, imagine a class, although not necessarily) knows about the inner workings or inner elements of another one, i.e. how much knowledge it has of the other component.

Cohesion is the indication of the relationship within a module.

Coupling is the indication of the relationships between modules.

Cohesion

• Cohesion is the indication of the relationship within module.
• Cohesion shows the module’s relative functional strength. 
• Cohesion is a degree (quality) to which a component / module focuses on the single thing. 
• While designing you should strive for high cohesion i.e. a cohesive component/ module focus on a single task (i.e., single-mindedness) with little interaction with other modules of the system.
• Cohesion is the kind of natural extension of data hiding for example, class having all members visible with a package having default visibility. Cohesion is Intra – Module Concept.

Coupling

• Coupling is the indication of the relationships between modules.
• Coupling shows the relative independence among the modules.
• Coupling is a degree to which a component / module is connected to the other modules.
• While designing you should strive for low coupling i.e. dependency between modules should be less
• Making private fields, private methods and non public classes provides loose coupling.
• Coupling is Inter -Module Concept.

check this link

https://stackoverflow.com/questions/3085285/difference-between-cohesion-and-coupling

模块与联系的度量（职责与协作的度量）：内聚与耦合

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原文地址：https://www.cnblogs.com/feng9exe/p/10180798.html