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polymorphism    音标拼音: [p,ɑlim'ɔrfɪzəm] [p,ɑlim'ɔrfɪzm]
n. 多形,同质异像,多形现象

多形,同质异像,多形现象

polymorphism
多型

polymorphism
n 1: (genetics) the genetic variation within a population that
natural selection can operate on
2: (chemistry) the existence of different kinds of crystal of
the same chemical compound [synonym: {polymorphism},
{pleomorphism}]
3: (biology) the existence of two or more forms of individuals
within the same animal species (independent of sex
differences)

Polymorphism \Pol`y*mor"phism\, n.
1. (Crystallog.) Same as {Pleomorphism}.
[1913 Webster]

2. (Biol.)
(a) The capability of assuming different forms; the
capability of widely varying in form.
(b) Existence in many forms; the coexistence, in the same
locality, of two or more distinct forms independent of
sex, not connected by intermediate gradations, but
produced from common parents.
[1913 Webster]

A concept first identified by
{Christopher Strachey} (1967) and developed by Hindley and
Milner, allowing {types} such as list of anything. E.g. in
{Haskell}:

length :: [a] -> Int

is a function which operates on a list of objects of any type,
a (a is a {type variable}). This is known as parametric
polymorphism. Polymorphic typing allows strong type checking
as well as generic functions. {ML} in 1976 was the first
language with polymorphic typing.

Ad-hoc polymorphism (better described as {overloading}) is the
ability to use the same syntax for objects of different types,
e.g. "" for addition of reals and integers or "-" for unary
negation or diadic subtraction. Parametric polymorphism
allows the same object code for a function to handle arguments
of many types but overloading only reuses syntax and requires
different code to handle different types.

See also {generic type variable}.

In {object-oriented programming}, the term is used to describe
a {variable} that may refer to objects whose {class} is not
known at {compile time} and which respond at {run time}
according to the actual class of the object to which they
refer.

(2002-08-08)


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  • What is polymorphism, what is it for, and how is it used?
    I believe it is incorrect to imply that polymorphism is specific to classes and or object-oriented programming, seeing how ad hoc polymorphism or parametric polymorphism do not necessarily require classes and or objects I think what this answer is talking about is subtyping (also known as subtype polymorphism or inclusion polymorphism)
  • oop - What is the difference between dynamic and static polymorphism in . . .
    Can anyone provide a simple example that explains the difference between Dynamic and Static polymorphism in Java?
  • Polymorphism vs Overriding vs Overloading - Stack Overflow
    65 Polymorphism means more than one form, same object performing different operations according to the requirement Polymorphism can be achieved by using two ways, those are Method overriding Method overloading Method overloading means writing two or more methods in the same class by using same method name, but the passing parameters is different
  • What is the main difference between Inheritance and Polymorphism?
    18 The main difference is polymorphism is a specific result of inheritance Polymorphism is where the method to be invoked is determined at runtime based on the type of the object This is a situation that results when you have one class inheriting from another and overriding a particular method
  • oop - What is polymorphism in JavaScript? - Stack Overflow
    Polymorphism is one of the tenets of Object Oriented Programming (OOP) It is the practice of designing objects to share behaviors and to be able to override shared behaviors with specific ones Polymorphism takes advantage of inheritance in order to make this happen In OOP everything is considered to be modeled as an object This abstraction can be taken all the way down to nuts and bolts
  • oop - Polymorphism (in C) - Stack Overflow
    Possible Duplicate: How can I simulate OO-style polymorphism in C? I'm trying to better understand the idea of polymorphism with examples from languages I know; is there polymorphism in C?
  • java - Why to use Polymorphism? - Stack Overflow
    Polymorphism (both runtime and compile time) is necessary in Java for quite a few reasons Method overriding is a run time polymorphism and overloading is compile time polymorphism
  • . net - How to Implement Polymorphic Request Bodies in ASP. NET Core Web . . .
    I am developing an ASP NET Core Web API where I need to allow clients to choose between multiple derived types when sending a PUT request I have set up polymorphism in my code using a base class and





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