Spring Autowire Fundamentals

Question

I am a newbie in Spring and am trying to understand the below concept.

Assume that accountDAO is a dependency of AccountService.

Scenar

Answer 1

Use @Component and @Autowire, it's the Spring 3.0 way

@Component
public class AccountService {
    @Autowired
    private AccountDAO accountDAO;
    /* ... */
}   

Put a component scan in your app context rather than declare the beans directly.