检查Object是否实现了接口 [英] Check if Object implements interface

问题描述

您好，


我有一个小问题。


我想知道如何检查对象是否符合界面。


我知道如果Class明确地实现了接口，就像这样：

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解决方案

所以你想知道一个对象是否实现了一个方法，但是该对象并不一定要实现该接口？我不太明白。如果界面存在，你应该使用instanceof来检查兼容性。


你可以解释一下。您是否只想知道类是否有方法？

感谢您的回复。

如果我只是想检查一些方法，但是如果我有一个接口，你的解决方案效果很好非常大，效率不高。


我想要的是这样的：

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我正在做一个可重用的类来过滤url输入。我们称之为 Url_Sanitize 。
Url_Sanitize 使用可以是任何类型的过滤器。该过滤器对象的唯一限制是实现一个接口，以便Url_Sanitize可以无所畏惧地（异常）调用接口中指定的过滤器方法。


好​​的我我认为有解决方案...


如果此人想要传递过滤器对象，则必须扩展过滤器类并实现我的界面。就是这样！


应用于我的例子它会是这样的：

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Hello,

I have a little question.

I would like to know how to check if an object is compliant with an interface.

I know that if the Class implements explicitly the Interface, like this:

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解决方案

So you want to know if an object implements a method, but the object doesn''t necessarily implement the interface? I don''t quite understand. If the interface exists, you should just use to instanceof to check compatibility.

You might explain a little more. Do you just want to know if a class has a method?

Thanks for your reply.
Your solution works well if i just want to check a few methods, but if i have an interface that is quite big, it will not be very efficient.

What I would like is something like this:

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I am doing a reusable class that filters the url input. Let''s call it Url_Sanitize.
Url_Sanitize uses a filter which can be of any type. The only restriction for that filter object, is to implement one interface, so that the Url_Sanitize can fearlessly (of an exception) call the filter methods that are specified in the interface.

Ok i have the solution, i think...

If the person wants to pass a filter object, the filter class must be extended and implement my interface. That''s it!

Applied to my example it would be something like this:

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