How can you declare a component or bean object in Spring?

In Spring, components or beans can be declared in several ways:

1. Annotations:

   • @Component — the basic annotation for automatic component detection.
   • Specialized annotations that extend @Component:
     • @Service — for the service layer.
     • @Repository — for the data access layer.
     • @Controller — for MVC controllers.

2. Configuration classes with the @Configuration annotation:

   • Inside such classes, you can declare methods with the @Bean annotation that return bean instances.

Example using @Bean:

@Configuration
public class AppConfig {
    @Bean
    public MyService myService() {
        return new MyServiceImpl();
    }
}

Thus, Spring allows declaring beans either through annotated classes and components or through configuration methods.