How will the behavior of a class change when using the @Component annotation in Spring?

The @Component annotation in Spring indicates that the class is a Spring component and should be automatically detected and registered in the application context as a Spring Bean. This means that Spring will create an instance of this class and manage its lifecycle.

Without @Component, the class is a regular POJO, and Spring will not automatically create or inject it.

Example:

@Component
public class MyService {
    public void doSomething() {
        System.out.println("Service work");
    }
}

Now, MyService can be injected into other components via @Autowired.

Thus, using @Component allows integrating the class into the Spring infrastructure, including dependency injection and lifecycle management.