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引用次数: 43

摘要

本文描述了将图灵机的停机问题简化为Java中的子类型检查问题。由此可见,Java中的子类型检查是不可判定的,这回答了Kennedy和Pierce在2007年提出的问题。Java的类型检查器也可以识别任何递归语言,这改进了Gill和Levy在2016年的研究结果。后一点由流畅接口的解析器生成器说明。
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Java generics are turing complete
This paper describes a reduction from the halting problem of Turing machines to subtype checking in Java. It follows that subtype checking in Java is undecidable, which answers a question posed by Kennedy and Pierce in 2007. It also follows that Java's type checker can recognize any recursive language, which improves a result of Gill and Levy from 2016. The latter point is illustrated by a parser generator for fluent interfaces.
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