java Enumset

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java 的 Enumset 类似 ArrayList，是对 Enum 类型的容器化，具有一些特定的方法： allof, range, complementOf

举例：

import java.util.EnumSet;public class EnumSetTest {enum Day {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;} public static void main(String[] args) {// Get all constants of the Day enumEnumSet<Day> allDays = EnumSet.allOf(Day.class);print(allDays, "All days: " );// Get all constants from MONDAY to FRIDAY of the Day enumEnumSet<Day> weekDays = EnumSet.range(Day.MONDAY, Day.FRIDAY);print(weekDays, "Weekdays: ");// Get all constants that are not from MONDAY to FRIDAY of the// Day enum Essentially, we will get days representing weekendsEnumSet<Day> weekends = EnumSet.complementOf(weekDays);print(weekends, "Weekends: ");}public static void print(EnumSet<Day> days, String msg) {System.out.print(msg);for(Day d : days) {System.out.print(d + " ");}System.out.println();}}

输出：

name=LOW, ordinal=0, days=30
name=MEDIUM, ordinal=1, days=15
name=HIGH, ordinal=2, days=7
name=URGENT, ordinal=3, days=1

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