通用接口比专用接口具有许多优点。它们往往更简单，使用的方法更少。它们还提供了类之间的更清晰的分隔，而专用接口则倾向于在类之间泄漏信息。使模块具有某种通用性是降低整体系统复杂性的最佳方法之一。
General-purpose interfaces have many advantages over special-purpose ones. They tend to be simpler, with fewer methods that are deeper. They also provide a cleaner separation between classes, whereas special-purpose interfaces tend to leak information between classes. Making your modules somewhat general-purpose is one of the best ways to reduce overall system complexity.