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