public ConfigurableApplicationContext run(String... args) {
		StopWatch stopWatch = new StopWatch();
		stopWatch.start();
		ConfigurableApplicationContext context = null;
		Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();
		configureHeadlessProperty();
		SpringApplicationRunListeners listeners = getRunListeners(args);
		listeners.starting();
		try {
			ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
			ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments);
			configureIgnoreBeanInfo(environment);
			Banner printedBanner = printBanner(environment);
			//@A
			context = createApplicationContext();
			exceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter.class,
					new Class[] { ConfigurableApplicationContext.class }, context);
			//@B
			prepareContext(context, environment, listeners, applicationArguments, printedBanner);
			//@C
			refreshContext(context);
			afterRefresh(context, applicationArguments);
			stopWatch.stop();
			if (this.logStartupInfo) {
				new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);
			}
			listeners.started(context);
			callRunners(context, applicationArguments);
		}
		catch (Throwable ex) {
			handleRunFailure(context, ex, exceptionReporters, listeners);
			throw new IllegalStateException(ex);
		}

		try {
			listeners.running(context);
		}
		catch (Throwable ex) {
			handleRunFailure(context, ex, exceptionReporters, null);
			throw new IllegalStateException(ex);
		}
		return context;
	}

org.springframework.boot.SpringApplication#run(java.lang.Class<?>, java.lang.String...)
->org.springframework.boot.SpringApplication#run(java.lang.String...)
->org.springframework.boot.SpringApplication#createApplicationContext 
//對(duì)應(yīng)上面@A標(biāo)注的地方
//后續(xù)會(huì)初始化一個(gè)org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext對(duì)象，在構(gòu)造方法里會(huì)執(zhí)行一系列的邏輯
->org.springframework.context.annotation.AnnotatedBeanDefinitionReader#AnnotatedBeanDefinitionReader(org.springframework.beans.factory.support.BeanDefinitionRegistry)
->org.springframework.context.annotation.AnnotatedBeanDefinitionReader#AnnotatedBeanDefinitionReader(org.springframework.beans.factory.support.BeanDefinitionRegistry, org.springframework.core.env.Environment)
->org.springframework.context.annotation.AnnotationConfigUtils#registerAnnotationConfigProcessors(org.springframework.beans.factory.support.BeanDefinitionRegistry)
->org.springframework.context.annotation.AnnotationConfigUtils#registerAnnotationConfigProcessors(org.springframework.beans.factory.support.BeanDefinitionRegistry, java.lang.Object)

//這個(gè)方法會(huì)注入5個(gè)bean定義：
1. ConfigurationClassPostProcessor.class
2. AutowiredAnnotationBeanPostProcessor.class
3. CommonAnnotationBeanPostProcessor.class
4. EventListenerMethodProcessor.class
5. DefaultEventListenerFactory.class

org.springframework.boot.SpringApplication#run(java.lang.String...)
org.springframework.boot.SpringApplication#prepareContext //對(duì)應(yīng)上面代碼標(biāo)注 @B 的地方
org.springframework.boot.SpringApplication#load
org.springframework.boot.BeanDefinitionLoader#load(java.lang.Object)
org.springframework.boot.BeanDefinitionLoader#load(java.lang.Class<?>)
org.springframework.context.annotation.AnnotatedBeanDefinitionReader#register
org.springframework.context.annotation.AnnotatedBeanDefinitionReader#registerBean(java.lang.Class<?>)
org.springframework.context.annotation.AnnotatedBeanDefinitionReader#doRegisterBean

//里面一段代碼 如下：
AnnotatedGenericBeanDefinition abd = new AnnotatedGenericBeanDefinition(beanClass);
//從這個(gè)方法里可以看出，啟動(dòng)類被包裝成了 AnnotatedGenericBeanDefinition（實(shí)現(xiàn)了AnnotatedBeanDefinition接口，這很重要）