Comment by limpbizkit:

*rbe5000*: the test is the same for both _Dependency Injection_ and  
_Dependency Injection with Guice_.

*alexnospam123*: take a look at  
[http://code.google.com/p/wave-protocol/source/browse/src/org/waveprotocol/wave/examples/fedone/
  
Google Wave Federation Protocol], which uses Guice.

*phasmal*: your second example doesn't compile. Instead, you'd write the  
code at the end of the _Dependency Injection_ section:
{{{
   public static void main(String[] args) {
     CreditCardProcessor processor = new PaypalCreditCardProcessor();
     TransactionLog transactionLog = new DatabaseTransactionLog();
     BillingService billingService
         = new RealBillingService(creditCardProcessor, transactionLog);
     ...
   }
}}}
This approach works! But if your PaypalCreditCardProcessor and  
DatabaseTransactionLog have dependencies of their own, this setup can get  
out of control. Guice addresses that problem with modules.


For more information:
http://code.google.com/p/google-guice/wiki/Motivation

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