不过，像Guice的作者一样，我更喜欢构造函数注入。

However, I prefer constructor injection, as do Guice's authors. Here's a quick analysis of the three styles.

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构造函数注入利用构造函数判断要返回的具体对象类型。

Constructor injection USES a constructor to determine what type of concrete object to return.

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根据Guice的最佳实践指南，构造函数注入是询问依赖项的首选方式。

According to the Guice best practices guide, constructor injection is the preferred way to ask for your dependencies.

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