Java: Upcasting and Dynamic Dispatch

It determines actual method execution. Frame the concept in practical terms so you can explain it during interview discussion.

Understanding the runtime type is crucial because it dictates which method implementations are executed, not the reference type. This enables polymorphism, where a single method call can have different behaviors depending on the runtime type of the object. For instance, two objects of runtime types `Book` and `Electronics` can both be referenced as `Product` and will execute their specific `display()` methods if overridden.