java中的enumset小结
java中的enumset其实是set的一个实现类了，但平常比较少用到，所以小结归纳下：

1 先定义一个枚举
public enum Seasons {
AUTMN,WINTER,SPRING,SUMMER
}

测试：

 EnumSet seasons = EnumSet.range(Seasons.AUTUMN,Seasons.SPRING);        for (Seasons season : seasons) {            System.out.println("SEASONS:"+season.name());        }        EnumSet complementEnumset = EnumSet.complementOf(seasons);        for (Seasons season : complementEnumset) {            System.out.println("SEASON:"+season.name());        }