UML diagrams

http://www.google.com.tw/imgres?imgurl=http://pineapplie.files.wordpress.com/2009/05/class.jpg&imgrefurl=http://pineapplie.wordpress.com/2009/05/15/4-uml-diagrams/&h=337&w=673&sz=29&tbnid=ld5ixZa_Ht1-eM:&tbnh=69&tbnw=138&prev=/images%3Fq%3Dwhat%2Bis%2Ba%2Bclass%2Bdiagram&usg=__oXxrx5s-kwSviso8TN7TVdrEel0=&ei=PN8BTOHvN9GPcIyi1NUB&sa=X&oi=image_result&resnum=3&ct=image&ved=0CCMQ9QEwAg