枚举(java.long包中的常用类之一)

枚举：

枚举是一组固定的常量组成的类型，使用关键字enum定,构造方法是，私有访问级别

使用枚举表示一组有限的值

       实例：定义表示性别的枚举，包括两个枚举常量分别代表“男”和“女”

      Public enum Gendors{

      Male,Female

      }

使用枚举实现输出每周日程信息

      定义一个枚举，包括7个枚举常量代表一周中的7天，编程实现查看一周中每天的日程安排。

      实现步骤：

            (1)    定义枚举常量

            (2)    查看一周中每天的日程安排           

                     Public enum Week{

                    MON,TUE,WED,TRU,FRI,SAT,SUN

                    }

                    public classWeekDemo{

                          Public void dowhat(Week day){

                               Switch(day){

                                Case Mon:

                                Case Tue:

                                Case Wed:

                                Case thu:

                                Case fri:

                                        Sysout(“工作日，努力工作”);

                                Case sat:

                                        Sysout(“星期六，休息，看电影”);

                                Case sun:

                                        Sysout(“星期日，休息，锻炼身体”);

                                Default:

                              }

                              }

                              Public staticvoid main(String [] args){

                              weekDemo wd=new weekDemo();

                              wd.dowhat(Week.thu);

                              Week sat=Week.sat;

                              Wd.doWhat(sat);

                              }

                              }

输出：工作日，努力工作

      星期六，休息，看电影