对List中每个对象元素按时间顺序排序

 1 import java.text.SimpleDateFormat;
 2 import java.util.*;
 3 
 4 public class ListSort {
 5     public static class UserBean {
 6         private String id;
 7         private String birthday;
 8 
 9         public String getId() {
10             return id;
11         }
12 
13         public void setId(String id) {
14             this.id = id;
15         }
16 
17         public String getBirthday() {
18             return birthday;
19         }
20 
21         public void setBirthday(String birthday) {
22             this.birthday = birthday;
23         }
24     }
25 
26     public static void main(String[] args) {
27         List<UserBean> list = new ArrayList<UserBean>();
28         UserListGenerate(list);
29         System.out.println("********排序前*******");
　　　　　　 for(UserBean user: list){
　　　　　　　　System.out.println(user.getBirthday());　　
　　　　　　 }
30 
31         ListSort(list);
32         System.out.println("******排序后*****");
　　　　　　 for(UserBean user: list){
　　　　　　　　System.out.println(user.getBirthday());
　　　　　　 }
33     }
34 
35     private static void UserListGenerate(List<UserBean> list) {
36         UserBean user1 = new UserBean();
37         UserBean user2 = new UserBean();
38         UserBean user3 = new UserBean();
39         user1.setId("zhagnsan");
40         user1.setBirthday("1980-11-01");
41 
42         user2.setId("lisi");
43         user2.setBirthday("1981-12-01");
44 
45         user3.setId("wangwu");
46         user3.setBirthday("1980-12-01");
47 
48         list.add(user1);
49         list.add(user2);
50         list.add(user3);
51     }
52 
53     private static void ListSort(List<UserBean> list) {
54         Collections.sort(list, new Comparator<UserBean>() {
55             @Override
56             public int compare(UserBean o1, UserBean o2) {
57                 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
58                 try {
59                     Date dt1 = format.parse(o1.getBirthday());
60                     Date dt2 = format.parse(o2.getBirthday());
61                     if (dt1.getTime() > dt2.getTime()) {
62                         return 1;
63                     } else if (dt1.getTime() < dt2.getTime()) {
64                         return -1;
65                     } else {
66                         return 0;
67                     }
68                 } catch (Exception e) {
69                     e.printStackTrace();
70                 }
71                 return 0;
72             }
73         });
74     }
75 }