spring framework demo

Application.java

@Configuration
@ComponentScan
public class Application {
    @Bean
    MessageService mockMessageService() {
        return new MessageService() {
            public String getMessage() {
                return "Hello Spring";
            }
        };
    }

    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(Application.class);
        MessagePrinter printer = context.getBean(MessagePrinter.class);
        printer.printMessage();
    }
}