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What is the benefit of using Interface Injection?  RSS feed

 
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I don't quite understand what is the benefit of using Interface Injection. It looks similar to Setter Injection but requires implementing an interface.
In which circumstance that we should use Interface Injection rather than Setter Injection?
 
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It's helpful when you want to inject mock objects for testing.
 
It is sorta covered in the JavaRanch Style Guide.
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