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The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class:? Starting from this section, we introduce in detail the concepts and application scenarios of 23 design patterns in Java, and analyze them in combination with their characteristics and the principles of design patterns.你们济世堂有多少大夫，先报出个人数，然后再让这位官差带人进去清点，看有没有其他人。? There have been three industrial revolutions in human history. The industrial revolution has greatly promoted the development of productive forces, brought earth-shaking changes to people's lives, and also changed the original layout of the world's industry. The countries leading the industrial revolution have become the dominant powers in the world. The first industrial revolution made Britain's empire never set. The east wind of the second industrial revolution made the United States and Germany dominate the world. The third industrial revolution maintained the global hegemony of the United States.春花气得又要吵，被樱桃喝住了，恨恨地看着绿竹。《武林风》是一档大型武术娱乐栏目，全方位、多角度展现中华武学的博大精深，是中国传统武术文化和现代电视艺术的完美结合，缤纷云集的武术套路、酣畅痛快的搏击场面、源远流长的文化底蕴、名星大腕现场助阵，使得《武林风》迅速成长为中华武术娱乐栏目第一品牌。《武林风》栏目每年举行的六大国际赛事（中美、中欧、中日、中泰、中伊、中越），为中国武术走向世界提供了很好的平台，同时也大大提高了《武林风》栏目的影响力。