我需要了解java中的枚举行为吗？ [英] I need to understand behaviour of enum in java example?

问题描述

第一个是枚举类

enum coffeeSize{
    BIG(8), HUGE(10), OVERWHELMING(16);
    private int ounces;
    coffeeSize(int ounces ){
        this.ounces = ounces;
    }
    public int getOunces(){
        return ounces;
    }

}

这是Class CoffeeTest1和main

This is class CoffeeTest1 and main

 public class CoffeeTest1 {
      coffeeSize size;

      public static void main (String args[]) {
          CoffeeTest1 drink1 = new CoffeeTest1();
          drink1.size = coffeeSize.BIG;

          System.out.println(" " + drink1.size.getOunces());
      }
}

以下是输出

8  

我的问题：
我不明白如何 drink1.size.getounces（）管理输出8.我没有给出构造函数 coffeeSize（ 8） object（例如： coffeeSize somex = new coffeeSize（BIG））。我想知道这个简单的微妙逻辑背后。有人可以帮我理解吗？

My question : I don't understand the how drink1.size.getounces() manage to output 8. I haven't given constructor coffeeSize(8) object (ex: coffeeSize somex = new coffeeSize(BIG)). I want to know this simple subtle logic behind. Can someone help me understand please?

推荐答案

我不明白drink1.size.getounces（）管理输出8。

I dont understand the how "drink1.size.getounces() " manage to output 8.

[...]

我想知道这个简单的微妙逻辑。

I want to know this simple subtle logic behind.

为了理解这个背后的逻辑，你可以将枚举作为一个常规的类（这是实际上如何编译）和

To understand the logic behind this, you can think of your enum as a regular class (which is actually how it is compiled), and

BIG(8)

作为类的一个实例类似于

as an instance of this class similar to

new coffeesize(8);

现在应该清楚为什么 drink1.size.getOunces（） code> print 8： BIG 只是 coffeesize 枚举的一个实例，您为此设置盎司构建时为8。

It should now be clear why drink1.size.getOunces() prints 8: BIG is just an instance of the coffeesize enum, for which you set ounces to 8 when constructing it.

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