What is the difference between parametric and subtype polymorphism?
Then T is the type of objects contained in the set (the notation indicates a so-called "type parameter", which is what makes it parametric polymorphism). In subtype polymorphism, you can reuse sets only with objects whose types are subtypes of a particular type.
What is a polymorphic type?
A polymorphic type is one whose operations can also be applied to values of some other type, or types. There are several fundamentally different kinds of polymorphism: Ad hoc polymorphism: when a function denotes different and potentially heterogeneous implementations depending on a limited range of individually specified types and combinations.
How does Java support parametric polymorphism?
Java supports parametric polymorphism via generics, which I'll discuss in a future article. Subtype means that a type can serve as another type's subtype. When a subtype instance appears in a supertype context, executing a supertype operation on the subtype instance results in the subtype's version of that operation executing.
Does polymorphism require subtyping?
Polymorphism does not require subtyping. It is the concept of object oriented programming.The ability of different objects to respond, each in its own way, to identical messages is called polymorphism. Polymorphism results from the fact that every class lives in its own namespace.
Parametric polymorphism Records