從code學習java tiger 之 枚舉
			
          
 			Posted on 2006-06-22 18:22 BlueO2 閱讀(348) 評論(0)  編輯  收藏  所屬分類: JAVA foundation 
			
			


		
          
		
          
		
          
				
				
				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);
          ????}          
						          
						
								
          
								????
          }          
				          
		
          

          
	
          


          
	    
    




          








          

				
          
	
	
	

          
	
          
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