Setter-based DI is generally used for optional dependencies. In case of setter-based DI, the container first creates an instance of your bean, either by calling a no-argument constructor or static factory method. It then passes the said dependencies through each setter method. Dependencies injected through the setter method can be re-injected or changed at a later stage of application.
We will understand setter-based DI with the following code base:
public class DocumentBase { private DocFinder docFinder; //Setter method to inject dependency. public void setDocFinder(DocFinder docFinder) { this.docFinder = docFinder; } public void performSearch() { this.docFinder.doFind(); }}public class DocFinder { public void doFind() { ...
