枚举（enum），是定义了一组排过序的单一实例的列表。

// 定义一个枚举
public enum Season {
    
    SPRING,SUMMER,AUTUMN,WINTER;
}

反编译代码后可以发现，上述代码可以等价于

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public final class Season extends Enum
{
    
    public static final Season SPRING;
    public static final Season SUMMER;
    public static final Season AUTUMN;
    public static final Season WINTER;
    private static final Season ENUM$VALUES[];
    static
    {
        SPRING = new Season("SPRING", 0);
        SUMMER = new Season("SUMMER", 1);
        AUTUMN = new Season("AUTUMN", 2);
        WINTER = new Season("WINTER", 3);
        ENUM$VALUES = (new Season[] {
            SPRING, SUMMER, AUTUMN, WINTER
        });
    }
}

使用方式

System.out.println(Season.AUTUMN);

输出结果为：AUTUMN

 

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