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Note that this is not in JDK 15, but an upcoming direction for the language: > The ability to reason clearly and conclusively about permitted subclasses will b

Note that this is not in JDK 15, but an upcoming direction for the language: > The ability to reason clearly and conclusively about permitted subclasses will be realized in a future release that supports pattern matching.

estebank 6y ago
I'm really intrigued at what pattern matching in Java will look like, and happy that our Java-land brethren will be able to use them. It's one of the features that I can't live without even though at first I thought of them as weird and "multiple ways of doing the same thing".
- vchernobyl 6y ago
  If you are interested, the draft for the pattern matching can be found here: https://openjdk.java.net/jeps/8213076 https://openjdk.java.net/jeps/8213076 If the final version ends up working as explained in the draft, it is going to be a fantastic addition to the language.
- carimura 6y ago
  in case you missed it, you might find this interesting: https://mail.openjdk.java.net/pipermail/amber-spec-experts/2020-August/002318.html https://mail.openjdk.java.net/pipermail/amber-spec-experts/2...
mabbo 6y ago
What, really? But http://openjdk.java.net/jeps/360 http://openjdk.java.net/jeps/360 says: > Release 15 Have they lied to me? Those monsters.
- funcDropShadow 6y ago
  That page is titled: "JEP 360: Sealed Classes (Preview)"
  - mabbo 6y ago
    ... good enough for me. I'll add whatever flags I need and begin depending on it in production code.