The setter injection is used to inject the dependencies through setter methods. In the following example, the instance of DataService uses the setter injection:
public class BusinessServiceImpl { private DataService dataService; @Autowired public void setDataService(DataService dataService) { this.dataService = dataService; } }
Actually, in order to use the setter injection, you do not even need to declare a setter method. If you specify @Autowired on the variable, Spring automatically uses the setter injection. So, the following code is all that you need for the setter injection for DataService:
public class BusinessServiceImpl { @Autowired private DataService dataService; }
