java list 排序

之前看到过list排序，后来忘记了，这次记录下来方便自己今后查询。


方法一，简单的list比较排序。

List<VO> lists = new ArrayList<VO>();

Collections.sort(lists, new Comparator<VO>() {

@Override

public int compare(VO o1, VO o2) {

return o1.getOrder().compareTo(o2.getOrder());

}

});

public class Test_list_order {

public static void main(String[] args) {

List<Integer> list = new ArrayList<Integer>();
list.add(1);
list.add(4);
list.add(9);
list.add(3);
list.add(2);
list.add(11);

Collections.sort(list);

for (Integer i : list) {
System.out.println(i);
}
}
}

实例：

class CorporateVO(){

private String siteOrder;

private String code;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

List<CorporateVO> lists = new ArrayList<CorporateVO>();

CorporateVO vo = new CorporateVO();

vo.setSiteOrder("1");

vo.setCode("222");

lists.add(vo);

CorporateVO vo1 = new CorporateVO();

vo1.setSiteOrder("1");

vo1.setCode("223");

lists.add(vo1);

CorporateVO vo2 = new CorporateVO();

vo2.setSiteOrder("1");

vo2.setCode("221");

lists.add(vo2);

CorporateVO vo3 = new CorporateVO();

vo3.setSiteOrder("2");

vo3.setCode("22");

lists.add(vo3);

CorporateVO vo4 = new CorporateVO();

vo4.setSiteOrder("3");

vo4.setCode("2");

lists.add(vo4);

Collections.sort(lists, new Comparator<CorporateVO>() {

@Override

public int compare(CorporateVO o1, CorporateVO o2) {

if(o1.getSiteOrder().equals(o2.getSiteOrder())){

return o1.getCode().compareTo(o2.getCode());

}

return o1.getSiteOrder().compareTo(o2.getSiteOrder());

}

});

for(CorporateVO v : lists){

System.out.println(v.getSiteOrder() + "------" + v.getCode());

}

}

输出结果：

1------221

1------222

1------223

2------22

3------2