Constructor injection USES a constructor to determine what type of concrete object to return.
构造函数注入利用构造函数判断要返回的具体对象类型。
Getting rid of the lookup code should sound familiar: this is effectively injection of the dependency on the type being advised!
去掉查找的代码应该听起来很熟悉:这是对被通知的类型的依赖有效的注入!
A type safe approach to dependency injection.
类型安全的依赖注入方式。
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