RecordPattern.java

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CompletableFuture.java

StreamCollector.java

RecordPattern.java

VirtualThread.java

MethodHandle.java

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RecordPattern.java

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sealed interface Shape permits Circle, Rectangle {}↵

record Circle(double radius) implements Shape {}↵

record Rectangle(double w, double h) implements Shape {}↵

↵

double area(Shape s) {↵

return switch (s) {↵

case Circle(var r) -> Math.PI * r * r;↵

case Rectangle(var w, var h) -> w * h;↵

};↵

}

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