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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 be realized in a future release that supports pattern matching.

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What, really?

But http://openjdk.java.net/jeps/360 says:

> Release 15

Have they lied to me? Those monsters.

That page is titled: "JEP 360: Sealed Classes (Preview)"

... good enough for me. I'll add whatever flags I need and begin depending on it in production code.

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".

If you are interested, the draft for the pattern matching can be found here: 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.

in case you missed it, you might find this interesting: https://mail.openjdk.java.net/pipermail/amber-spec-experts/2...

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