java基础：枚举（你木有见过的船新版本）

public class DaysOfTheWeekConstants {
    public static final int MONDAY = 0;
    public static final int TUESDAY = 1;
    public static final int WEDNESDAY = 2;
    public static final int THURSDAY = 3;
    public static final int FRIDAY = 4;
    public static final int SATURDAY = 5;
    public static final int SUNDAY = 6;
}

/**
 * 定义了一个枚举
 */
public enum Reg {
    red,greed,blue
}

/**
 * 测试枚举类型
 */
public class Enums {
    public static void main(String[] args) {
        //获取到枚举中的一个值
        Reg red=Reg.red;
        System.out.println(red);
        //通过values遍历枚举
        Reg[] values = Reg.values();
        for (Reg value : values) {
            System.out.println(value);
        }
    }
}