Java 如何使用EnumSet类

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import java.util.EnumSet;

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enum Day {

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  MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;

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}

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public class Main {

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  public static void main(String[] args) {

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    // Get all constants of the Day enum  

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    EnumSet<Day> allDays = EnumSet.allOf(Day.class);

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    print(allDays, "All days: " );

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    // Get all constants from MONDAY to FRIDAY of the Day enum  

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    EnumSet<Day> weekDays = EnumSet.range(Day.MONDAY, Day.FRIDAY);

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    print(weekDays, "Weekdays: ");

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    EnumSet<Day> weekends = EnumSet.complementOf(weekDays);

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    print(weekends, "Weekends: ");    

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  }

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  public static void print(EnumSet<Day> days, String msg) {

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