为什么维基百科说“多态与方法重载或方法覆盖不同". [英] Why does Wikipedia say "Polymorphism is not the same as method overloading or method overriding."

问题描述

我环顾四周，找不到任何类似的问题.

这是我从 Wikipedia 得到的段落:p>

多态与方法重载或方法覆盖不同.多态性仅涉及将特定实现应用于接口或更通用的基类.方法重载是指在同一个类中具有相同名称但不同签名的方法.方法覆盖是子类替换其父类的一个或多个方法的实现的地方.方法重载和方法覆盖本身都不是多态性的实现.

这里有人可以更清楚地解释它，尤其是多态性与方法覆盖不同"部分吗?我现在很困惑.提前致谢.

解决方案

多态(很简单地说)是在需要基类的地方使用派生类的可能性:

类基{}类派生扩展基{}基数 v = new Derived();//行

另一方面，方法覆盖是 Wiki 所说的一种改变派生类中方法行为的方法:

类形状{void draw() {/* 这里什么都没有，可以是抽象的*/}}类方形扩展形状{@覆盖void draw() {/* 在这里画正方形 */}}

重载与继承无关，它允许定义更多同名的函数，但它们的参数不同.

I have looked around and could not find any similar question.

Here is the paragraph I got from Wikipedia:

Polymorphism is not the same as method overloading or method overriding. Polymorphism is only concerned with the application of specific implementations to an interface or a more generic base class. Method overloading refers to methods that have the same name but different signatures inside the same class. Method overriding is where a subclass replaces the implementation of one or more of its parent's methods. Neither method overloading nor method overriding are by themselves implementations of polymorphism.

Could anyone here explain it more clearly, especially the part "Polymorphism is not the same as method overriding"? I am confused now. Thanks in advance.

解决方案

Polymorphism (very simply said) is a possibility to use a derived class where a base class is expected:

class Base {

}

class Derived extends Base  {

}

Base v = new Derived(); // OK

Method overriding, on the other hand, is as Wiki says a way to change the method behavior in a derived class:

class Shape  {
  void draw() { /* Nothing here, could be abstract*/ }
}

class Square extends Shape  {
  @Override
  void draw() { /* Draw the square here */ }
}

Overloading is unrelated to inheritance, it allows defining more functions with the same name that differ only in the arguments they take.

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