Collections比较list集合里面对象的大小

private static XmlNode getNewestVer(List<XmlNode> verNodes){

           Collections.sort(verNodes, new Comparator<XmlNode>()){

                    @override

                     public int compare(XmlNode xmlNode,XmlNode xmlNode1){

                             String v = xmlnode.getAttr("v");

                             int ver = Integer.parseInt(v.replace("v",""));

                             String v1 = xmlnode1.getAttr("v");                            

                             int ver1 = Integer.parseInt(v1.replace("v",""));

                             return ver-ver1;

                     }

           };

           XmlNode xmlNode = verNodes.get(verNodes.size() - 1);

           return xmlNode;

}