The coupling According to from strong to weak order types

    From strong to weak coupling according to the order can be divided into the following types:

    1.Content coupling. When a module directly modify or operationof another module data, or directly into another module, came thecontent coupling. At this time, the modified module entirely dependent on the modification of its modules.

    2.Public coupling. More than two module refers to a global data item is called the common coupling.

    3.The external coupling. If a set of modules are accessing the same data item, then known as the external coupling.

    4.Control coupling. A module for transmitting a signal at the interface (such as switch value, logo etc.) to control anothermodule, signal receiving module action is adjusted according to thesignal value, called control coupling.

Elastomer Coupling

    5.Mark coupling. Module through parameter passing complex internal data structures, called marker coupling. Change this data structure will enable the relevant module changes.

    6.The data coupling. Module through parameter passing the basictypes of data, called data coupling.

    7.Non direct coupled. No information module, belonging to the non direct coupled.

    If there must be a coupling between modules, use as far as possible data coupling, less control coupling, limit the scope ofpublic coupling, resolutely avoid using content coupling.

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