/**     * int ordinal()    * int compareTo(E o)    * String name()    * String toString()    * <T> T valueOf(Class<T> type,String name)    * values()     * 此方法虽然在JDK文档中查找不到，但每个枚举类都具有该方法，它遍历枚举类的所有枚举值非常方便     */    public static void main(String[] args) {        //demo1();//      Week2 mon = Week2.valueOf(Week2.class, "MON");      //通过字节码对象获取枚举项//      System.out.println(mon);        Week2[] arr = Week2.values();        for (Week2 week2 : arr) {            System.out.println(week2);        }    }    public static void demo1() {        Week2 mon = Week2.MON;        Week2 tue = Week2.TUE;        Week2 wed = Week2.WED;        /*System.out.println(mon.ordinal());                //枚举项都是有编号的        System.out.println(tue.ordinal());        System.out.println(wed.ordinal());        System.out.println(mon.compareTo(tue));         //比较的是编号        System.out.println(mon.compareTo(wed));*/        System.out.println(mon.name());                 //获取实例名称        System.out.println(mon.toString());             //调用重写之后的toString方法    }