@Override
            public int compare(Method o1, Method o2) {
                return o1.getName().compareTo(o2.getName());
            }
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