0基礎學java_枚舉

枚舉Enum

所謂的枚舉就是規定好了指定的範圍，全部的內容都是從指定的範圍內取出。

舉例：

 1 package com.feimao.a1;  2 
 3 
 4 class Color {  5     public static final Color RED = new Color("紅色");  6     public static final Color GREEN = new Color("綠色");  7     public static final Color YELLOW = new Color("黃色");  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 }

 

舉例：枚舉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