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Full paper (PDF) - Cornell University

Full paper (PDF) - Cornell University 2025

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The paper introduces masked types as a solution to the object initialization problem in programming, particularly addressing issues related to constructors and null-pointer exceptions. Masked types provide a type-state mechanism that tracks the initialization state of objects, preventing access to uninitialized fields. The authors present a new language, J\mask, which implements these concepts and allows for modular type checking while supporting complex initialization patterns, including cyclic data structures. The effectiveness of masked types is demonstrated through their application in real code, showing improvements in reliability and expressiveness.

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