Sample ApplicationComponent class https://hackernoon.com/yet-another-mvp-article-part-2-how-dagger-helps-with-the-project-90d049a45e00

ApplicationComponent.java

package com.mirhoseini.marvel;
/*...*/

@Singleton
@Component(modules = {
        AndroidModule.class,
        ApplicationModule.class,
        ApiModule.class,
        DatabaseModule.class,
        ClientModule.class
})
public interface ApplicationComponent {
        
    void inject(MainActivity activity);
    SearchSubComponent plus(AppSearchModule module);
    CacheSubComponent plus(AppCacheModule module);
        
}