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Do Java generics work like that? I thought the JVM did not know about the generics as the types are erased at compile time.

JVM doesn't know about generic types at the runtime. There's no specialization of HashMaps, it's just arrays of points to objects all around.

With project Valhalla: https://en.wikipedia.org/wiki/Project_Valhalla_(Java_languag... there's been talk about specialization for value types.

It is already available for those that want to play with it.

I too thought the same. That's why pcwalton's comment confused me.

Rust generics do. Java's don't.