使用接口的优势是什么?
											使用接口调用类的方法跟直接调用类的方法比,有什么优势?????										
					
	 2007-05-15 12:21
	    2007-05-15 12:21
   2007-05-15 13:42
	    2007-05-15 13:42
   2007-05-15 14:21
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   2007-05-15 14:39
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   2007-05-15 15:46
	    2007-05-15 15:46
  
 2007-05-16 14:53
	    2007-05-16 14:53
   2007-05-16 15:04
	    2007-05-16 15:04
   2007-05-16 17:09
	    2007-05-16 17:09