JAVA's interface construct is widely perceived as a weak surrogate for multiple inheritance. Consequently, it should come as no surprise that despite their potential for writing highly decoupled code, interfaces are used rather sparingly. We have devised a conceptual framework for the utilization of interfaces in JAVA programs, and suggest tool support lessening the coding effort induced by the introduction and maintenance of additional interfaces, as well as a metrics suit measuring how and to which extent interfaces are actually used.
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