0基础学java_枚举

枚举Enum

所谓的枚举就是规定好了指定的范围，所有的内容都是从指定的范围内取出。

举例：

 1 package com.feimao.a1;
 2 
 3 
 4 class Color {
 5     public static final Color RED = new Color("红色");
 6     public static final Color GREEN = new Color("绿色");
 7     public static final Color YELLOW = new Color("黄色");
 8     private String name;
 9 
10     private Color(String name) {
11         this.name = name;
12     }
13 
14     public void setName(String name) {
15         this.name = name;
16     }
17 
18     public String getName() {
19         return name;
20     }
21 
22     public static Color getInstance(int i) {
23         switch (i) {
24             case 1: {
25                 return RED;
26             }
27             case 2: {
28                 return GREEN;
29             }
30             case 3: {
31                 return YELLOW;
32             }
33             default: {
34                 return null;
35             }
36         }
37     }
38 }
39 
40 public class EnumDemo02 {
41     public static void main(String args[]) {
42         Color c1 = Color.RED;
43         System.out.println(c1.getName());
44         Color c2 = Color.getInstance(2);
45         System.out.println(c2.getName());
46 
47     }
48 
49 }

 

举例：枚举enum

 1 enum Color{
 2 
 3        RED , GREEN ,YELLOW;
 4 
 5 }
 6 
 7 public class EnmuDemo01{
 8 
 9      public static void main(String args[]){
10 
11         Color c = Color.GREEN;
12 
13         System.out.println(c);
14 
15          }
16 
17      }
18

 

posted @ 2018-11-07 00:03  肥猫与猪宝宝  阅读(97)  评论(0)  编辑  收藏  举报