按照列表中的某个字段的属性进行排序

java开发中时常遇到排序的问题。尤其是遇到针对某个bo，po之类的实体bean属性的值进行排序是就要使用Collections这个工具类，就显得格外方便。

/**

  * @decription:对列表进行排序

  * @param args

  */

 public static void main(String[] args) {

  List<WaterMamBgalarminfo> listForCompare = new ArrayList<WaterMamBgalarminfo>();

  WaterMamBgalarminfo po1 = new WaterMamBgalarminfo();

  WaterMamBgalarminfo po2 = new WaterMamBgalarminfo();

  WaterMamBgalarminfo po3 = new WaterMamBgalarminfo();

  WaterMamBgalarminfo po4 = new WaterMamBgalarminfo();

  po1.setQkalarminfoid(new Integer(6));

  po2.setQkalarminfoid(new Integer(4));

  po3.setQkalarminfoid(new Integer(5));

  po4.setQkalarminfoid(new Integer(7));

  listForCompare.add(po1);

  listForCompare.add(po2);

  listForCompare.add(po3);

  listForCompare.add(po4);

  comPare(listForCompare);

  for(WaterMamBgalarminfo po:listForCompare){

   System.out.println(po.getQkalarminfoid());

  }

 }

 static void comPare(List list){

  Collections.sort(list, new Comparator<WaterMamBgalarminfo>() {

   @Override

   public int compare(WaterMamBgalarminfo o1, WaterMamBgalarminfo o2) {

    return o1.getQkalarminfoid()-o2.getQkalarminfoid();

   }

  });

 }

}