Subtyping in Java with Generics and Wildcards is a Fractal

For helping themselves in writing, debugging and maintaining their software, professional OO software developers keep in their minds an image of the subtyping relation between types in their software while they are developing their software. In pre-generics Java, the structure of the subtyping mental image was simple: the graph of the subtyping relation between classes and interfaces (i.e., with multiple-inheritance of interfaces) was a Directed-Acyclic Graph (or DAG), and the graph of the subtyping relation between classes alone (i.e., with single-inheritance only, more accurately called the 'Subclassing' relation) was simply a tree.

Provided by: Cornell University Topic: Enterprise Software Date Added: Dec 2014 Format: PDF

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