上面getbean 方法参数是字符串，下面参数是类，@SuppressWarnings("unchecked")有什么用？2个 getbean方法反回的都是接口实例化么？
@SuppressWarnings("unchecked")
protected <T extends Object> T getBean(String beanId) {
try {
return (T)context.getBean(beanId);
} catch (BeansException e) {
e.printStackTrace();
return null;
}
}
protected <T extends Object> T getBean(Class<T> clazz) {
try {
return context.getBean(clazz);
} catch (BeansException e) {
e.printStackTrace();
return null;
}
}
