在类中声明的枚举类型是否隐式静态？ [英] Are enum types declared in a class implicitly static?

问题描述

CoffeeSize {BIG，HUGE，OVERWHELMING}
CoffeeSize size;
CoffeeSize size;
}

class CoffeeTest {
public static void main（String [] args）
{
咖啡饮料=新咖啡（）;
drink.size = Coffee.CoffeeSize.BIG;
}
}

Coffee.CoffeeSize.BIG ：我可以得到 CoffeeSize 只需使用类名称 Coffee 。我认为枚举类型是隐式静态的我是否正确？

解决方案

是的，是的。语言规范甚至这样说。从 JLS第8.9节（枚举）：

嵌套枚举类型是隐式静态的。明确声明嵌套的枚举类型为静态是允许的。

class Coffee{   
   enum CoffeeSize{BIG,HUGE,OVERWHELMING}   
   CoffeeSize size;   
  }   

class CoffeeTest{   
   public static void main(String[] args)   
  {   
       Coffee drink=new Coffee();   
       drink.size=Coffee.CoffeeSize.BIG;   
   }   
} 

Coffee.CoffeeSize.BIG: i can get CoffeeSize just using the class name Coffee. Am I correct when I think the enum type is implicitly static?

解决方案

Yes, it is. The language specification even says so. From the JLS section 8.9 (enums):

Nested enum types are implicitly static. It is permissable to explicitly declare a nested enum type to be static.

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