接口和抽象类继承，扩展类中的实现 [英] Interfaces and abstract class inheritance, implementation in extended classes

问题描述

在我看过的每个例子中，扩展类都实现了父类的接口。作为参考，以下示例：

In every example I've seen, extended classes implement the interfaces of their parents. For reference, the following example:

interface MyInterface{
    public function foo();
    public function bar();
}

abstract class MyAbstract implements MyInterface{
    public function foo(){ /* stuff */ }
    public function bar(){ /* stuff */ }
}

// what i usually see
class MyClass extends MyAbstract implements MyInterface{}

// what i'm curious about
class MyOtherClass extends MyAbstract{}

是否未能在子级中实现接口，这是实现的由父母，被认为是不良做法或什么？忽略孩子的实施有任何技术缺陷吗？

Is failure to implement an interface in a child, which is implemented by a parent, considered bad practice or something? Are there any technical drawbacks to omitting the implementation in the child?

推荐答案

我会认为你是在正确的道路上。在扩展已经实现的类时，无需声明您正在实现该接口。对我来说，如果需要更改，它只是另一段代码。所以，是的，你是对的！

I would consider that you are on the right path. There is no need to declare that you are implementing the interface, when extending a class that already implements it. For me it's just another piece of code to maintain if change is needed. So, yes, you are correct!

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