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  • 创建Java不可变型的枚举类型Gender

    创建Java不可变型的枚举类型,其实例如下:

     1 // 创建不可变型的枚举类
     2 enum Gender {
     3     // 此处的枚举值必须调用对应的构造器来创建
     4     MALE("男"), FEMALE("女");
     5 
     6     // 或者,使用下面两个语句代替上面语句
     7     // public static final Gender MALE = new Gender("男");
     8     // public static final Gender FEMALE = new Gender("女");
     9 
    10     private final String name;
    11 
    12     // 枚举类的构造器只能使用private修饰,以使其不可变
    13     private Gender(String name) {
    14         this.name = name;
    15     }
    16 
    17     public String getName() {
    18         return this.name;
    19     }
    20 }
    21 
    22 
    23 public class GenderImmutableTest {
    24     public static void main(String[] args) {
    25         Gender g = Gender.MALE;
    26         System.out.println(g + ":" + g.getName());        
    27     }
    28 }
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  • 原文地址:https://www.cnblogs.com/bluepoint2009/p/create-immutable-enum-class.html
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