使用枚举做参数，只能用枚举有中的值

interface SeasonInterface { // 四季接口
int SPRING = 1, SUMMER = 2, AUTUMN = 3, WINTER = 4;
}

enum SeasonEnum { // 四季枚举
SPRING, SUMMER, AUTUMN, WINTER
}

public class SeasonDemo {

public static void printSeason1(int season) {
    switch (season) {
    case SeasonInterface.SPRING:
        System.out.println("这是春季");break;
    case SeasonInterface.SUMMER:
        System.out.println("这是夏季");break;
    case SeasonInterface.AUTUMN:
        System.out.println("这是秋季");break;
    case SeasonInterface.WINTER:
        System.out.println("这是冬季");break;
    default:
        System.out.println("这不是四季的常量值");
    }
}

public static void printSeason2(SeasonEnum season) {
    switch (season) {
    case SPRING:
        System.out.println("这是春季");break;
    case SUMMER:
        System.out.println("这是夏季");break;
    case AUTUMN:
        System.out.println("这是秋季");break;
    case WINTER:
        System.out.println("这是冬季");break;
    }
}

public static void main(String[] args) {
    printSeason1(SeasonInterface.SPRING);   // 使用接口常量做参数
    printSeason1(3);                        // 可以使用数字做出参数
    printSeason1(-1);                   // 也使用接口常量值以外的数字“冒充”常量
    printSeason2(SeasonEnum.WINTER);    // 使用枚举做参数，只能用枚举有中的值，无法“冒充”
}

}