java traits还是mixins模式？ [英] java traits or mixins pattern?

问题描述

有没有办法在java中模拟mixins或traits？基本上，我需要一种方法来进行多重继承，这样我就可以将常用的业务逻辑添加到几个类中

Is there a way to emulate mixins or traits in java? basically, I need a way to do multiple inheritance so I can add common business logic to several classes

推荐答案

我会封装所有的将业务逻辑转换为新类 BusinessLogic ，并让每个需要 BusinessLogic 的类调用该类。如果您需要为您的类调用 BusinessLogic 的单个根目录层次结构，则还必须创建一个接口（ BusinessLogicInterface ？）

I would encapsulate all of the business logic into a new class BusinessLogic and have each class that needs BusinessLogic make calls to the class. If you need a single rooted heirarchy for your classes that make calls to BusinessLogic, you'll have to create an interface as well (BusinessLogicInterface?)

在伪代码中：

interface BusinessLogicInterace
{
    void method1();
    void method2();
}

class BusinessLogic implements BusinessLogicInterface
{
    void method1() { ... }
    void method2() { ... }
}

class User 
    extends OtherClass 
    implements BusinessLogicInterface
{
    BusinessLogic logic = new BusinessLogic();

    @Override
    void method1() { logic.method1(); }

    @Override
    void method2() { logic.method2(); }
}

这不是最缺乏多重继承的最佳实现当界面有很多方法时，它变得非常麻烦。最有可能的是，您需要尝试重新设计代码以避免需要mixins。

This isn't the prettiest implementation to work around a lack of multiple inheritance and it becomes quite cumbersome when the interface has a lot of methods. Most likely, you'll want to try and redesign your code to avoid needing mixins.

这篇关于java traits还是mixins模式？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！