[转]鸭子-策略模式（Strategy）转:http://www.cnblogs.com/justinw/archive/2007/02/06/641414.html
[转]鸭子-策略模式（Strategy）
转:http://www.cnblogs.com/justinw/archive/2007/02/06/641414.html
[转]鸭子-策略模式（Strategy）
转:http://www.cnblogs.com/justinw/archive/2007/02/06/641414.html