The constructor injection, on the other hand, uses a constructor to inject dependencies. The following code shows how to use a constructor for injecting in DataService:
public class BusinessServiceImpl { private DataService dataService; @Autowired public BusinessServiceImpl(DataService dataService) { super(); this.dataService = dataService; } }
When you run the code with the preceding implementation of BusinessServiceImpl, you will see this statement in the log, asserting that autowiring took place using the constructor:
Autowiring by type from bean name 'businessServiceImpl' via constructor to bean named 'dataServiceImpl'
