Here I've used the new keyword enum, given the enum a name, and specified the allowed values. Grade then becomes an enumerated type, which you can use in a manner shown in Listing 3.
在这里,我使用了新的关键字enum,为enum提供了一个名称,并指定了允许的值。
This illustrates how both the name and integer value of the Enum instance are readily available.
这说明了单位的名称及整数枚举实例的值都是现成的。
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