They are to allow destructuring of any class that has them declared - deconstructors must be defined explicitly and require an exact match. This document proposes the introduction of Deconstructors, which are a generalization of the solutions created for records. Last week Brian Goetz published an analysis of Deconstruction patterns on the possibility of implementing deconstruction of objects other than just records. So it seems that the fall will belong to Project Amber.Īnd while we're on the topic Pattern Matching and record deconstruction - JDK developers don't plan to stop there. As noted by Reddit's /r/java, although both JEPs still remain in Draft, the code examples in them clearly refer specifically to JDK 21. That's not all, however - all indications are that we'll also get two more JEPs in JDK 21 - Record Patterns and Pattern Matching for switches. Just to close the topic, I had quite a smile seeing the quote from Søren Kierkegaard in original JEP summary. For this reason, basically, every existing collection approached the topic differently: Until now, the JDK lacked an interface that could define collections with elements in a clearly defined order, while allowing easy iteration over them forward and backward. The resulting mechanism looks really flexible and goes far beyond simple filling strings with variables.Īnother addition already announced is JEP 431: Sequenced Collections. The user will also be able to define custom processors. processor, which allows for additional formattings, such as defining float decimal precision. was used, which simply performs interpolations. The whole thing is based on so-called processors, in the above examples STR. It is also possible to pass whole expressions: int x = 10 String address = "1 Maple Drive, Anytown" To better visualize, one example from the JEP: String name = "Joan Smith"
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