Why it matters

Valhalla is Java's most significant type system evolution. Understanding shapes future performance patterns.

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The architecture

Value classes: objects without identity. Cannot be compared with ==. Cannot be locked.

Specialized generics: List<int> without boxing.

Valhalla directionValue classesno identitySpecialized genericsno boxingBetter memory layoutflat storageEnables C-like performance for data-oriented code while keeping Java's abstractions
Valhalla goals.
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How it works end to end

Value class syntax (proposed): 'value class Point(int x, int y) {}'. Similar to record but without identity.

Universal generics: type parameters may be primitives.

Performance: eliminate object header + reference indirection.