list 根据某个字段进行排序

Comparator<VmsInboundLot> netTypeComparator = new Comparator<VmsInboundLot>() {    
@Override
public int compare(VmsInboundLot o1, VmsInboundLot o2) {
return o1.getCountNum() - o2.getCountNum();   //倒叙  
}
};

Collections.sort(list,netTypeComparator);