International Journal of Computer and Systems Engineering Volume 1 Issue 1 Article 4 July 2020 Declarative Immutability in Java John Crowley Boston College, University of Pennsylvania,
[email protected] Follow this and additional works at: https://digitalcommons.fairfield.edu/ijcase Recommended Citation Crowley, John (2020) "Declarative Immutability in Java," International Journal of Computer and Systems Engineering: Vol. 1 : Iss. 1 , Article 4. Available at: https://digitalcommons.fairfield.edu/ijcase/vol1/iss1/4 This item has been accepted for inclusion in DigitalCommons@Fairfield by an authorized administrator of DigitalCommons@Fairfield. It is brought to you by DigitalCommons@Fairfield with permission from the rights- holder(s) and is protected by copyright and/or related rights. You are free to use this item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses, you need to obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/or on the work itself. For more information, please contact
[email protected]. Declarative Immutability in Java Online at https://digitalcommons.fairfield.edu/ijcase/ Published by Fairfield University, DigitalCommons@Fairfield © 2020 Vol. 1, No. 1, 2020 Declarative Immutability in Java by John D. Crowley ABSTRACT A pervasive mechanism is proposed to declare that variables and object instances are mutable or immutable, and whether methods mutate instances. These declarations are integral to the type structure of the language and allow the developer to declare, and the reader (and compiler) to determine, if a variable or instance is immutable (even if other instances of the Class are mutable) or that an instance is immutable throughout the application (a Pure instance).