创建新对象和依赖注入之间的区别 [英] Difference between creating new object and dependency injection

问题描述

创建新对象和依赖注入有什么区别？请详细解释。

What is the difference between creating a new object and dependency injection? Please explain in detail.

推荐答案

好吧，
创建一个新对象就像它可以得到的一样 - 你创建所需类的新实例。

Well, creating a new object is as explicit as it can get - you create a new instance of the desired class.

依赖注入是一种为您提供所需参考的机制。
想象一个表示数据库连接池的类 - 通常只有该类的一个实例。现在，您需要将该引用分发给使用它的所有类。
这里是依赖注入派上用场的地方 - 通过使用像Eclipse这样的DI框架你可以定义你的池的一个实例将注入到需要它的类中。

Dependency injections is a mechanism that provides you with references where you need them. Imagine a class that represents a connection pool to your database - you usually only have one instance of that class. Now you need to distribute that reference to all the classes that use it. Here is where Dependency Injection comes in handy - by using a DI framework such as Spring you can define that the one instance of your pool will be injected into the classes that need it.

您的问题本身并不容易回答，因为无法轻易地比较对象和依赖注入的创建......

Your question itself is not easy to answer since the creation of an object and dependency injection can't be compared that easily...

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