是使用父类对象进行子类方法调用的可能性 [英] Is a Possibility for Child class methods calls with parent class object

问题描述

早上好，

子类方法可能与父类对象一起调用吗?
我可以实例化父类，也想检索Child类的方法.

有可能吗?

比Q

Hi morning,

Is a Possibility for Child class methods calls with parent class object?
I can instantiate parent class and also i want to retrieve Child class methods..

is it possible?

Than Q

推荐答案

这里有问题.在第一个中，尚不清楚它是什么意思: with 父类对象.中是模棱两可的短语.您是指父"类对象的参数，还是什么?通常，派生类的对象(子"和父"类)不是很精确的术语，可能意味着基类"和派生"类)可以完成基类对象的所有工作.

第二个问题则相反.如果您实例化了基类的对象，则它与其派生类无关.此外，术语检索"方法是没有意义的.反射中有类似的内容，但我不认为这与您要询问的内容有关.

如果您还有其他意思，请解释.这个问题充满不确定性.

—SA

There are questions here. In a first one, it''s not clear what does it mean: with parent class object. In is ambiguous phrase. Do you mean with parameter of a "parent" class object, or what? Very generally, and object of a derived class ("child" and "parent" are not quite precise terms, probably you mean "base" and "derived" classes) can do everything an object of a base class do.

The second question is the opposite. If you instantiated an object of a base class, it does not no anything about its derived class. Besides, the term "retrieve" a method makes no sense. There is something similar in Reflection, but I don''t thin this is related to what you meant to ask about.

If you mean something else, please explain. The question is full of uncertainties.

—SA

您认为战略模式"吗?好吧，您不会直接调用派生类的方法，而是会调用它们.
想象一个像这样的函数:

Do you think of "strategy pattern"? Well, you do not call the methods of the derived class directly - but you do call them.
Imagine a function like:

public virtual void DoSomething()
{
    DoStep1();
    DoStep2();
}

protected abstract void DoStep1();
protected virtual void DoStep2()
{
    //some code
}

调用DoSomething时，将调用派生类的DoStep1方法以及可能的DoStep2方法.

这些是C#签名，但是这些概念在Java中也可用. [/Edit]

When DoSomething is called, the DoStep1 method, and possibly the DoStep2 method, of the derived class are being called.

Those are C# signatures, but the concepts are also available in Java. [/Edit]

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