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Dependency injection design pattern [duplicate]

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What is dependency injection?

S开发者_开发百科pring uses dependency injection pattern. Can someone show a simple example of this pattern? I heard there is another pattern called service locator, which one is better?


Service locator is a J2EE "Core Patterns" idiom.

Let's define "better" before we debate it, shall we?

They aren't really competitors, IMO. Not every dependency happens over a network. Spring can do remoting and proxying, but that's not the sum of all dependencies.

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