Java：枚举的使用

目录

一、基础使用

二、枚举实现星期表示

一、基础使用

public enum SeasonEnum {SPRING,SUMMER, AUTUMN, WINTER
}

public static void main(String[] args) {SeasonEnum season = SeasonEnum.SUMMER;System.out.println("Current season: " + season);for (SeasonEnum s : SeasonEnum.values()) {System.out.println("Season: " + s +", Ordinal: " + s.ordinal() +  //enum常量声明顺序，避免使用，顺序易受重构影响", Name: " + s.name());}switch (season) {case SPRING:System.out.println("It's springtime!");break;case SUMMER:System.out.println("It's summertime!");break;case AUTUMN:System.out.println("It's autumn!");break;case WINTER:System.out.println("It's wintertime!");break;default:System.out.println("Unknown season!");}}

输出：

Current season: SUMMER
Season: SPRING, Ordinal: 0, Name: SPRING
Season: SUMMER, Ordinal: 1, Name: SUMMER
Season: AUTUMN, Ordinal: 2, Name: AUTUMN
Season: WINTER, Ordinal: 3, Name: WINTER
It's summertime!

二、枚举实现星期表示

public enum DayOfWeek {MONDAY("星期一", "Monday"),TUESDAY("星期二", "Tuesday"),WEDNESDAY("星期三", "Wednesday"),THURSDAY("星期四", "Thursday"),FRIDAY("星期五", "Friday"),SATURDAY("星期六", "Saturday"),SUNDAY("星期日", "Sunday");private final String chineseName;private final String englishName;// 枚举构造函数DayOfWeek(String chineseName, String englishName) {this.chineseName = chineseName;this.englishName = englishName;}// 获取中文名称public String getChineseName() {return chineseName;}// 获取英文名称public String getEnglishName() {return englishName;}// 判断是否为工作日public boolean isWeekday() {return this != SATURDAY && this != SUNDAY;}// 判断是否为周末public boolean isWeekend() {return this == SATURDAY || this == SUNDAY;}// 获取下一天public DayOfWeek nextDay() {return values()[(this.ordinal() + 1) % values().length];}
}

public class WeekdayEnumExample {public static void main(String[] args) {// 示例用法DayOfWeek today = DayOfWeek.MONDAY;System.out.println("星期枚举示例:");System.out.println("================================");// 遍历所有枚举值for (DayOfWeek day : DayOfWeek.values()) {System.out.printf("%-10s %-10s %-10s %s%n",day,day.getChineseName(),day.getEnglishName(),day.isWeekday() ? "工作日" : "周末");}System.out.println("================================");// 特定日期的操作示例System.out.println("今天是: " + today.getChineseName() + " (" + today.getEnglishName() + ")");System.out.println("是工作日吗? " + today.isWeekday());System.out.println("明天是: " + today.nextDay().getChineseName());// 使用valueOf方法DayOfWeek friday = DayOfWeek.valueOf("FRIDAY");System.out.println("周五是: " + friday.getChineseName());}
}

输出：

星期枚举示例:
================================
MONDAY     星期一        Monday     工作日
TUESDAY    星期二        Tuesday    工作日
WEDNESDAY  星期三        Wednesday  工作日
THURSDAY   星期四        Thursday   工作日
FRIDAY     星期五        Friday     工作日
SATURDAY   星期六        Saturday   周末
SUNDAY     星期日        Sunday     周末
================================
今天是: 星期一 (Monday)
是工作日吗? true
明天是: 星期二
周五是: 星期五