首先来看看我们为何要使用依赖注入，它能带来什么好处。考虑下列代码。

First, let's explore why dependency injection is beneficial. Consider the following class and method.

youdao

首先来看看我们为何要使用依赖注入，它能带来什么好处。考虑下列代码。

First, let's explore why dependency injection is beneficial. Consider the following class and method.

youdao