java对存放实体的list进行排序

java对存放实体的list进行排序：

List<DistributionAgentsEntity> allAgents = new ArrayList<DistributionAgentsEntity>();Collections.sort(allAgents, new Comparator<DistributionAgentsEntity>() {public int compare(DistributionAgentsEntity o1, DistributionAgentsEntity o2) {return o2.getSum().compareTo(o1.getSum());}});