Usage of @Autowired

@Autowired is wired by type.

If an interface UserInterface has multiple implementation classes

AImpl（@service（name="userInterface1"）)

BImpl（@service（name="userInterface2"））

These implementation classes are added to the Spring container.

There are several ways to inject instances:
1. Distinguish different instances by adding the annotation @Qualifier

@Autowire
@Qualifier("userInterface1")
iUserInterface iUserInterface;

2. Distinguish different instances by @Resource(name="userInterface1")

@Resource(name="userInterface1")
iUserInterface iUserInterface;

3. Keep userInterface consistent with the AImpl class object name (this method is not recommended)

@Autowired
private IUserInterface userInterface1;
@Autowired
private IUserInterface userInterface2;