Comment by [email protected]:
Binding annotations (also known as Qualifiers in JSR330) let you bind
multiple implementations of the same interface and distinguish between
them. While it may look that depending on "@PayPal CreditCardProcessor" is
the same as depending directly on the PayPalCreditCardProcessor
implementation, it isn't because using the interface means that I can bind
a different implementation to "@PayPal CreditCardProcessor" for testing
purposes - or for additional auditing purposes, etc.
Depending on PayPalCreditCardProcessor directly means I can only inject
that, or a sub-class of it, which is a much tighter constraint.
For more information:
http://code.google.com/p/google-guice/wiki/BindingAnnotations
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