1.简介

java中，使用关键字enum来定义枚举类，枚举类是一个特殊的类，大部分功能和普通类是一样的，区别为：

• 枚举类继承了java.lang.Enum类，而不是默认的Object类。而java.lang.Enum类实现了java.lang.Serializable和java.lang.Comparable接口。
• 非抽象的枚举类默认会使用final修饰，因此不能派生子类

实例：

enum Weekend {
    MONDAY, TUESDAY, WEDNESDAY,THURSDAY,FRIDAY,SATURADAY,SUNDAY;
}

枚举类的values方法返回一个列表

package com.example.main;

public class App {
    
    public static void printDay(Weekend wd) {
        switch (wd) {
        case MONDAY:
            System.out.println("today is monday...");
            break;
        case TUESDAY:
            System.out.println("today is tuesday...");
            break;
        case WEDNESDAY:
            System.out.println("today is wednesday...");
            break;
        case THURSDAY:
            System.out.println("today is thursday...");
            break;
        case FRIDAY:
            System.out.println("today is friday...");
            break;
        case SATURADAY:
            System.out.println("today is saturday...");
            break;
        case SUNDAY:
            System.out.println("today is sunday...");
            break;
        }
    }

    public static void main(String[] args) {
        printDay(Weekend.SUNDAY);
        for (Weekend wd : Weekend.values()) {
            System.out.println(wd);
        }
    }

}


enum Weekend {
    MONDAY, TUESDAY, WEDNESDAY,THURSDAY,FRIDAY,SATURADAY,SUNDAY;
}

2.带有构造方法的枚举类

enum WeekendWithG {
    MONDAY("星期一"), TUESDAY("星期二"), WEDNESDAY("星期三"),
    THURSDAY("星期四"),FRIDAY("星期五"),SATURADAY("星期六"),
    SUNDAY("星期日");
    
    private final String name; 
    private WeekendWithG(String name) {
        this.name = name;
    }
    
    public String getName() {
        return this.name;
    }
}