java 中的枚举类
模拟一个枚举类 日常我们遇到用一个静态类来定义常量
public class Weekday {
public static final int SUN = 0;
public static final int MON = 1;
public static final int TUE = 2;
public static final int WED = 3;
public static final int THU = 4;
public static final int FRI = 5;
public static final int