从code学习java tiger 之 枚举

public   enum  User  {
    Admin,User,Guest,Unknown   
}

public   class  Login  {
    
     private  User user;
    EnumMap < User,String >  userName  =   new  EnumMap < User, String > (User. class );
     /** */ /**  Creates a new instance of Login  */
     public  Login()  {
        userName.put(User.Admin,  " Administrator " );
        userName.put(User.User,  " David " );
        userName.put(User.Guest,  " Steve " );
    }
     public   boolean  isAdmin(User user) {
         if (user.equals(User.Admin)) {
             return   true ;
        }
         return   false ;
    }
     public   void  printUserRole() {
        User[] users  =  user.values();
         for (User u : user.values()) {
            System.out.println(u.toString());
        }
    }
     public   void  isRole(User user) {
         switch (user) {
             case  Admin:
                System.out.println( " admin " );
                 break ;
             case  User:
                System.out.println( " User " );
                 break ;
             case  Guest:
                System.out.println( " Guest " );
                 break ;
             default :
                System.out.println( " unknow " );
        }
    }
     public   static   void  main(String[] args) {
        Login login  =   new  Login();
        System.out.println(login.isAdmin(User.Admin));
        login.printUserRole();
        login.isRole(User.User);
    }
    
}