新鲜出炉的盛大面试经历

继续说昨天跟踪的事情，我跟踪从XmlBeanFactory开始，其通过XmlBeanDefinitionReader载入xml配置文件中的BeanDefinition信息。随后通过beanDefinition来获取class

Constructor constructorToUse = (Constructor) beanDefinition.resolvedConstructorOrFactoryMethod;
			if (constructorToUse == null) {
				Class clazz = beanDefinition.getBeanClass();
				if (clazz.isInterface()) {
					throw new BeanInstantiationException(clazz, "Specified class is an interface");
				}
				try {
					constructorToUse = clazz.getDeclaredConstructor((Class[]) null);
					beanDefinition.resolvedConstructorOrFactoryMethod = constructorToUse;
				}
				catch (Exception ex) {
					throw new BeanInstantiationException(clazz, "No default constructor found", ex);
				}
			}
			return BeanUtils.instantiateClass(constructorToUse, null);

 上面代码关键一句就是Class clazz = beanDefinition.getBeanClass();接着调用BeanUtils来创建实例

	public static Object instantiateClass(Constructor ctor, Object[] args) throws BeanInstantiationException {
		Assert.notNull(ctor, "Constructor must not be null");
		try {
			ReflectionUtils.makeAccessible(ctor);//配置可见
			return ctor.newInstance(args);//创建实例
		}
		catch (InstantiationException ex) {
			throw new BeanInstantiationException(ctor.getDeclaringClass(),
					"Is it an abstract class?", ex);
		}
		catch (IllegalAccessException ex) {
			throw new BeanInstantiationException(ctor.getDeclaringClass(),
					"Has the class definition changed? Is the constructor accessible?", ex);
		}
		catch (IllegalArgumentException ex) {
			throw new BeanInstantiationException(ctor.getDeclaringClass(),
					"Illegal arguments for constructor", ex);
		}
		catch (InvocationTargetException ex) {
			throw new BeanInstantiationException(ctor.getDeclaringClass(),
					"Constructor threw exception", ex.getTargetException());
		}
	}

   从上面代码知道获取bean实例不就是通过class.getDeclaredConstructor().newInstance(args)生成的？？这中方式除了叫反射，难道还有别的名字？