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  • 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 }
    1. public class ListSort {  
    2.     public static class UserBean {  
    3.         private String id;  
    4.         private String birthday;  
    5.   
    6.         public String getId() {  
    7.             return id;  
    8.         }  
    9.   
    10.         public void setId(String id) {  
    11.             this.id = id;  
    12.         }  
    13.   
    14.         public String getBirthday() {  
    15.             return birthday;  
    16.         }  
    17.   
    18.         public void setBirthday(String birthday) {  
    19.             this.birthday = birthday;  
    20.         }  
    21.     }  
    22.   
    23.     public static void main(String[] args) {  
    24.         List<UserBean> list = new ArrayList<UserBean>();  
    25.         UserListGenerate(list);  
    26.         System.out.println("排序前："+list);  
    27.   
    28.         ListSort(list);  
    29.         System.out.println("排序后："+list);  
    30.     }  
    31.   
    32.     private static void UserListGenerate(List<UserBean> list) {  
    33.         UserBean user1 = new UserBean();  
    34.         UserBean user2 = new UserBean();  
    35.         UserBean user3 = new UserBean();  
    36.         user1.setId("zhagnsan");  
    37.         user1.setBirthday("1980-11-01");  
    38.   
    39.         user2.setId("lisi");  
    40.         user2.setBirthday("1981-12-01");  
    41.   
    42.         user3.setId("wangwu");  
    43.         user3.setBirthday("1980-12-01");  
    44.   
    45.         list.add(user1);  
    46.         list.add(user2);  
    47.         list.add(user3);  
    48.     }  
    49.   
    50.     private static void ListSort(List<UserBean> list) {  
    51.         Collections.sort(list, new Comparator<UserBean>() {  
    52.             @Override  
    53.             public int compare(UserBean o1, UserBean o2) {  
    54.                 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");  
    55.                 try {  
    56.                     Date dt1 = format.parse(o1.getBirthday());  
    57.                     Date dt2 = format.parse(o2.getBirthday());  
    58.                     if (dt1.getTime() > dt2.getTime()) {  
    59.                         return 1;  
    60.                     } else if (dt1.getTime() < dt2.getTime()) {  
    61.                         return -1;  
    62.                     } else {  
    63.                         return 0;  
    64.                     }  
    65.                 } catch (Exception e) {  
    66.                     e.printStackTrace();  
    67.                 }  
    68.                 return 0;  
    69.             }  
    70.         });  
    71.     }  
    72. }
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  • 原文地址：https://www.cnblogs.com/MrRightZhao/p/8033320.html
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