Java enum

Posted 2020-08-01 One-Way

 

 1 /**
 2  * Created by Edward on 2016/6/30.
 3  */
 4 public class TestEnum {
 5 
 6     //方法一
 7     public enum SexEnum{
 8         MALE,FEMALE;
 9     }
10 
11     //方法二
12     public enum SexEnum1{
13         MALE(1),
14         FEMALE(2);
15 
16         private int id;
17 
18         //私有构造函数
19         private SexEnum1(int id)
20         {
21             this.id=id;
22         }
23 
24         //获取值对应的enum对象
25         public static SexEnum1 getEnum(int id)
26         {
27             for(SexEnum1 s : SexEnum1.values())
28             {
29                 if(s.id == id)
30                 return s;
31             }
32             return null;
33         }
34     }
35 
36 
37     public static void main(String[] argv)
38     {
39         //列出enum的name
40         for(SexEnum sex : SexEnum.values())
41             System.out.println(sex.name());
42 
43         //通过 ENUM 访问
44         SexEnum sex = SexEnum.MALE;
45         switch(sex)
46         {
47             case MALE:
48                 System.out.println("男性");
49                 break;
50             case FEMALE:
51                 System.out.println("女性");
52                 break;
53             default:
54                 System.out.println("其他");
55                 break;
56         }
57 
58         //通过值获取 enum对象
59         SexEnum1 s = SexEnum1.getEnum(3);
60         switch(s)
61         {
62             case MALE:
63                 System.out.println("男");
64                 break;
65             case FEMALE:
66                 System.out.println("女");
67                 break;
68             default:
69                 System.out.println("其他");
70                 break;
71         }
72 
73     }
74 }