@Override
            public int compare(Entry<Class<?>, Object> o1, Entry<Class<?>, Object> o2) {
                return o1.getKey().getSimpleName().compareTo(o2.getKey().getSimpleName());
            }
Scans a set of classes for Swagger annotations.

@param swagger is the Swagger instance
@param classes are a set of classes to scan
doc-swagger/src/main/java/com/alipay/sofa/rpc/doc/swagger/generate/Reader.java