对List中每个对象元素按时间顺序排序

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

public class ListSort {
public static class UserBean {
private String id;
private String birthday;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
}
public static void main(String[] args) {
List<UserBean> list = new ArrayList<UserBean>();
UserListGenerate(list);
System.out.println("排序前："+list);
ListSort(list);
System.out.println("排序后："+list);
}
private static void UserListGenerate(List<UserBean> list) {
UserBean user1 = new UserBean();
UserBean user2 = new UserBean();
UserBean user3 = new UserBean();
user1.setId("zhagnsan");
user1.setBirthday("1980-11-01");
user2.setId("lisi");
user2.setBirthday("1981-12-01");
user3.setId("wangwu");
user3.setBirthday("1980-12-01");
list.add(user1);
list.add(user2);
list.add(user3);
}
private static void ListSort(List<UserBean> list) {
Collections.sort(list, new Comparator<UserBean>() {
@Override
public int compare(UserBean o1, UserBean o2) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
try {
Date dt1 = format.parse(o1.getBirthday());
Date dt2 = format.parse(o2.getBirthday());
if (dt1.getTime() > dt2.getTime()) {
return 1;
} else if (dt1.getTime() < dt2.getTime()) {
return -1;
} else {
return 0;
}
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}
});
}
}