“枚举”的用法是什么在Java中？ [英] What's the use of "enum" in Java?

问题描述

所以我调查了这个枚举类型，它似乎是一个荣耀的数组 / ArrayList / 列表给我。究竟是用什么呢？

解决方案

枚举是一种固定数量的常量，至少可以用于两件事情。
$ b

常量

  public enum Month {
 JANUARY ，FEBRUARY，... 
} 
  

这比创建一堆整数好多了常数。

创建单身人士

  public enum Singleton {
 INSTANCE 
 
 // init 
}; 
  

你可以用枚举来做相当有趣的事情，看看这里

还要看看官方文件

So I looked into this "enum" type, and it kind of seems like a glorified array/ArrayList/List to me. What exactly is the use of it?

解决方案

Enum serves as a type of fixed number of constants and can be used at least for two things

constant

public enum Month {
    JANUARY, FEBRUARY, ...
}

This is much better than creating a bunch of integer constants.

creating a singleton

public enum Singleton {
    INSTANCE

   // init
};

You can do quite interesting things with enums, look at here

Also look at the official documentation

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