匿名vs命名的内部类？ - 最佳做法？ [英] Anonymous vs named inner classes? - best practices?

问题描述

我有一个类，让我们称之为LineGraph，它渲染一个线图。我需要子类化它，但派生类只在一个地方使用，并耦合到使用它的类。所以我使用一个内部类。

I have a class, let's call it LineGraph, that renders a line graph. I need to subclass it, but the derived class is only used in one place and is coupled to the class that uses it. So I am using an inner class.

我看到两种方法：

匿名内部类

public class Gui {
    LineGraph graph = new LineGraph() {
        // extra functionality here.
    };
}

命名的内部类

public class Gui {
    MyLineGraph graph = new MyLineGraph();

    private class MyLineGraph extends LineGraph {
        // extra functionality here.
    }
}

我不是匿名内部类的粉丝，因为坦白地说，我只是认为它看起来真的很丑陋。但是在子类只使用在一个地方的情况下，是一个命名的内部类overkill？

I am not a fan of anonymous inner classes, because frankly I just think it looks really ugly. But in the case of a subclass that's only used in one place, is a named inner class overkill? What is the accepted practice?

推荐答案

匿名内部类的一个优点是没有人可以在任何地方使用它，而命名的内部类可以使用（如果只有通过创建它的类，如果私人）。这是一个小的区别，但它的确意味着你可以保护一个内部类不被意外使用在其他地方。

One advantage of anonymous inner classes is that no one can ever use it anywhere else, whereas a named inner class can be used (if only by the class that created it if made private). It's a small distinction, but it does mean that you can protect an inner class from being accidentally used elsewhere.

此外，使用匿名内部类给任何人阅读你的代码a头像 - 这个类正在这里和没有其他地方使用。如果你看到一个命名的内部类，有人可能会认为它会在类中的多个地方使用。

Also, using the anonymous inner class gives anyone reading your code a head's up - "this class is being used just here and nowhere else." If you see a named inner class, someone might think it'd be used in multiple places in the class.

它们非常相似，变换器。我只是认为如果你使用匿名内部类为一次性，并命名内部类，当它在类中使用多次时，有助于清晰。

They are very similar, so neither point is a game-changer. I just think it helps for clarity if you use anonymous inner classes for one-offs, and named inner classes when it's used multiple times within the class.

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