void createAccount(ICustomer c) { ... } // No dependency to concrete Customer class Customer implements ICustomer { ... } // Customer Class can be created afte

void createAccount(ICustomer c) { ... } // No dependency to concrete Customer class Customer implements ICustomer { ... } // Customer Class can be created after Account above createAccount(new Customer()) // Use of both, with dependency injection Scanning for classes dynamically using reflection has nothing to do with above. And you certainly don't need any xml or framework to do it either.