Gangmax Blog

Spring @Autowired Annotation

From here.

Today I just know that in Spring, if there are different bean instances with the same type, we can “autowire” all of them into a collection or a map of that common type. Such as:

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// Assume we have multiple MovieCatalog Spring beans defined.
public class MovieRecommender {

    @Autowired
    private MovieCatalog[] movieCatalogs;

    // ...
}
// Or:
public class MovieRecommender {

    private Set<MovieCatalog> movieCatalogs;

    @Autowired
    public void setMovieCatalogs(Set<MovieCatalog> movieCatalogs) {
        this.movieCatalogs = movieCatalogs;
    }

    // ...
}
// Or:
public class MovieRecommender {

    private Map<String, MovieCatalog> movieCatalogs;

    @Autowired
    public void setMovieCatalogs(Map<String, MovieCatalog> movieCatalogs) {
        this.movieCatalogs = movieCatalogs;
    }

    // ...
}

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