Featherweight
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Hoi,
Kann mir jemand erklären, was Featherweight Java jetzt eigentlich ist?
Es ist doch eine Art Typensystem oder?
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Kann denn keiner helfen
?
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Ich dachte, hier gibt es zu Haufen selbsternannte Java-Experten? Warum kommt da nix?
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Stell dir mal vor, daran habe ich auch schon gedacht. Hilft mir aber nicht, deshalb frage ich ja hier.
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Several recent studies have introduced lightweight versions of Java: reduced languages in which complex features like threads and reflection are dropped to enable rigorous arguments about key properties such as type safety. We carry this process a step further, omitting almost all features of the full language (including interfaces and even assignment) to obtain a small calculus, Featherweight Java, for which rigorous proofs are not only possible but easy. Featherweight Java bears a similar relation to Java as the lambda-calculus does to languages such as ML and Haskell. It offers a similar computational "feel," providing classes, methods, fields, inheritance, and dynamic typecasts, with a semantics closely following Java's. A proof of type safety for Featherweight Java thus illustrates many of the interesting features of a safety proof for the full language, while remaining pleasingly compact. The minimal syntax, typing rules, and operational semantics of Featherweight Java make it a handy tool for studying the consequences of extensions and variations. As an illustration of its utility in this regard, we extend Featherweight Java with generic classes in the style of GJ (Bracha, Odersky, Stoutamire, and Wadler) and give a detailed proof of type safety. The extended system formalizes for the first time some of the key features of GJ.
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