Java - Override an object created in Constructor?

Question

In the following Spring service I am creating ClassToCreate in the constructor of MyService .

 @Service("MyService")
 public class MyService {

  private final Repository repository;
  private final ClassToCreate classToCreate;

        @Autowired
        public MyService(
                Repository repository,
                @Value("${path}") String path
                ) {

            this.ClassToCreate = new ClassToCreate(repository, path);
        }

        public void myMethod(Object object){

        String appendedPath = path + object.id();

        //create different instance of classToCreate with variable appended
        ClassToCreate classToCreate = new ClassToCreate(repository, appendedPath);

        classToCreate.doSomething();

        }


    }

What is the best way to create and use a different instance of ClassToCreate as I am attmempting in myMethod rather than use what is in the constuctor?

I want to create a different instance of the class here using the path from constructor but with the object.id appended as the path for ClassToCreate . I also need to use the same repository value as is passed into the MyService constructor.

Answer 1

You can use composition. You can use a component (@Component in Spring). Create factory method which returns objects of ClassToCreate.

@Component

public class ClassToCreateFactory {

private Repository repository;
private String path;

@Autowired
public ClassToCreateFactory (Repository repository, @Value("${path}") String path) {
    this.repository = repository;
    this.path = path;
}    

public static ClassToCreate getClassToCreate() {
    return new ClassToCreate(repository, path);
}

}