Abstract
The ubiquitous GUI interface enables people to interact with a software system. Many ABAP programmers are familiar with the acronym RICEF, in which the “I” represents Interfaces and most often is associated with data exchanges with external systems.
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Notes
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It also is known as a “stand-alone interface.”
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It is for this reason that I hesitate to include the definitions of variables in the set of components offered by an interface, since they would be publicly visible, hence modifiable by external entities. Although not technically prohibited, the inclusion of variables in interface definitions should be avoided by programmers not wanting to violate the principles of encapsulation.
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The format of invoking a method as shown here is intended to be language independent, but closely resembles the format found with both Java and ABAP.
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The attribute values shown for this entry represent those for the Navajo Generating Station near Page, Arizona, which consumes about 8 million tons of coal per year. Accordingly, its values shown for capacity in fuel unit and current level in fuel unit represent a 60-day and 30-day supply, respectively.
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A case can be made that loose coupling also occurs when an instance of a subclass is referenced as an instance of one of its superclasses; however, such an arrangement depends on class inheritance and limits the flexibility to within the same inheritance hierarchy. By contrast, interfaces are not limited by such constraints.
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© 2017 James E. McDonough
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McDonough, J.E. (2017). Interfaces. In: Object-Oriented Design with ABAP. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-2838-8_7
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DOI: https://doi.org/10.1007/978-1-4842-2838-8_7
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