Spring Framework - @Component Examples

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class MyPrototypeBean {

    @Autowired
    @Qualifier("basic-service")
    private MyService myService;

    public void doSomething(){
        System.out.println(myService.getMessage());
    }
}

import org.springframework.stereotype.Component;

import jakarta.annotation.PostConstruct;

@Component
public class MySingletonBean {

    @PostConstruct
    public void init() {
        System.out.println("initializing " +
                this.getClass().getSimpleName());
    }
}

@Lazy
@Service("basic-service")
public class ServiceImplA implements MyService {

    @PostConstruct
    private void init() {
        System.out.println("initializing lazily " +
                this.getClass().getSimpleName());
    }

    @Override
    public String getMessage() {
        return "Message from " + getClass().getSimpleName();
    }
}