JEP 401: Value Classes and Objects (Preview)
JEP 401 introduces value classes and objects in Java, focusing on optimizing memory efficiency by distinguishing objects solely by their field values, not identity. This feature enhances performance for simple domain values.
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JEP 401 aims to introduce value classes and objects to the Java Platform, allowing developers to opt into a programming model where objects are distinguished solely by their field values, not their identity. This feature aims to enhance memory efficiency and garbage collection by optimizing simple values representation. It does not introduce a struct feature or change the treatment of primitive types. The motivation behind this enhancement is to address the performance issues related to object identity, especially for simple domain values like colors or currency. By opting out of object identity, developers can benefit from a programming model that combines the abstraction of classes with the performance benefits of primitives. Value classes are a preview language feature that can be enabled to create objects without identity, improving memory usage and data locality. The JEP also includes migrating popular classes like Integer to this new programming model, emphasizing the importance of distinguishing objects based on their values rather than their identity.
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4 commentsI couldn't tell from the page.
And yet, doing so is explicitly a non-goal of this work, is that because it needs a migration plan nobody can stomach? Before trying Rust I would have doubted that this just doing the Right Thing was important, but now I would co-sign that in a moment. I bet I've avoided a dozen bugs per year by having the == operator do what I meant not something that was easier to implement.
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