Spring - Interface

Why interface in Spring:

• As we know, the core concept of spring is DI. To achieve this we have to go for interface.
• And Interface gives us better readability.
• And we can give multiple implementation and we can use to inject in another bean using qualifier seperation.

eg.

@Autowired

@Qualifier ("jdbcdevice")

private DeviceDao device;

     (or)

@Resource(name = "jdbcdevice")

private DeviceDao device;