Rust Static and Dynamic Dispatch

Tue, 05 May 2026 12:00:00 +0530

In Java, there are two broad use cases for type abstraction:

Compile-time polymorphism: A class or function works over different data types while preserving type safety. For example, ArrayList<User>, HashMap<String, Double>, Optional<User>. The compiler ensures that there is no type mismatch and prevents a variable of type ArrayList<User> from being assigned an ArrayList<String>.
Runtime polymorphism: The code uses the advertised capabilities of an interface but does not determine the concrete implementation. For example, a method accepts List<User> but the caller can pass ArrayList<User> or LinkedList<User>.

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