What’s the difference between the Dependency Injection and Service Locator patterns?

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The difference may seem slight, but even with the ServiceLocator, the class is still responsible for creating its dependencies. It just uses the service locator to do it. With DI, the class is given its dependencies. It neither knows, nor cares where they come from. One important result of this is that the DI example is much easier to unit test — because you can pass it mock implementations of its dependent objects. You could combine the two — and inject the service locator (or a factory), if you wanted.

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