问题描述
在采访中我被问到以下问题。
如果我可以模拟抽象类作为接口，为什么java提供了接口？
这意味着如果在抽象类中我可以将所有方法标记为抽象，然后抽象类将作为接口，所以为什么我需要接口。
这是一个非常标准的面试问题。答案是：因为你可以实现多个接口，但是不能扩展多个抽象类。
JRE中的例子： LinkedList 是列表和 Deque 。这些接口定义了类的行为。它们不提供任何实现细节。虽然抽象类可以提供
相关问题：和。后者不直接相关，但它显示了为什么需要接口，即使在一个抽象类足够的情况下。
In interview I have been asked following question. I tried to answer the question but I want exact answer of the question.
If I can simulate Abstract class as Interface, why java provided Interface?
This mean if in Abstract class I can mark all methods as abstract and then abstract class will work as interface, so why I need interface.
Can anyone explain me in brief.
That's a very standard interview question. The answer is: because you can implement multiple interfaces, but can't extend multiple abstract classes.
Example from the JRE: LinkedList is both a List and a Deque. These interfaces define the behaviour of the class. They do not provide any implementation details. While abstract classes could provide some.
Related questions: this and this. The latter is not directly related, but it shows why are interfaces needed, even in cases when an abstract class would suffice.
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