Comment by [email protected]:

In the very last code snippet on the Motivation page, we have the following...

`BillingService billingService = injector.getInstance(BillingService.class);`

...which means (thanks to the binding) that the actual type of billingService is RealBillingService, right?

However, in the very last code snippet on _this_ page, we have the following...

`RealBillingService billingService = injector.getInstance(RealBillingService.class);`

...but we haven't bound RealBillingService.class to anything in BillingModule, and we've only injected the RealBillingService constructor (not the entire RealBillingService class). Why does this work, and what are the differences between these two approaches?

For more information:
https://code.google.com/p/google-guice/wiki/GettingStarted

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