如何在Dart中定义接口？ [英] How to define interfaces in Dart?

问题描述

在Java中，我可能有一个接口 IsSilly 以及一个或多个实现它的具体类型：

In Java, I might have an interface IsSilly and one or more concrete types that implement it:

public interface IsSilly {
    public void makePeopleLaugh();
}

public class Clown implements IsSilly {
    @Override
    public void makePeopleLaugh() {
        // Here is where the magic happens
    }
}

public class Comedian implements IsSilly {
    @Override
    public void makePeopleLaugh() {
        // Here is where the magic happens
    }
}

Dart中此代码的等价物是什么？

What's the equivalent to this code in Dart?

在仔细阅读官方 docs ，似乎Dart没有本机接口类型。那么，平均Dartisan如何完成界面隔离原则？

After perusing the official docs on classes, it doesn't seem that Dart has a native interface type. So, how does the average Dartisan accomplish the interface segregation principle?

推荐答案

在Dart中有隐式接口。

每个类都隐式定义一个接口，该接口包含类的所有实例成员及其实现的任何接口。如果你想创建一个支持B类API的A类而不继承B的实现，那么A类应该实现B接口。

Every class implicitly defines an interface containing all the instance members of the class and of any interfaces it implements. If you want to create a class A that supports class B’s API without inheriting B’s implementation, class A should implement the B interface.

一个类通过声明来实现一个或多个接口它们在中实现子句，然后提供接口所需的API。

A class implements one or more interfaces by declaring them in an implements clause and then providing the APIs required by the interfaces.

所以你的例子可以在Dart中翻译如下：

So your example can be translate in Dart like this :

abstract class IsSilly {
  void makePeopleLaugh();
}

class Clown implements IsSilly {
  void makePeopleLaugh() {
    // Here is where the magic happens
  }
}

class Comedian implements IsSilly {
  void makePeopleLaugh() {
    // Here is where the magic happens
  }
}

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