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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:后来者必须按照《佛本是道》的框架结构来写，否则书友们根本不买账。"Cancer is a Chronic Disease" published in the 10th edition of Wenzhou Daily on November 24, 2006 did not say its content, but only the title, which was very good.举报Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.Eda从小失去双亲，由姑姑抚养长大。她相信知识改变命运，用功读书，全靠奖学金从小学一路念到大学。然而这个梦想被一次留学奖学金发放失误打破，Eda不仅失去了去意大利深造的机会，同时也失去了原本大学的学籍，男友也只能只身一人前往意大利。失去学业的她只能在姑姑的花店帮工，把怨气撒在了颁发奖学金的企业家Serkan身上。                                    这是一个浪漫凄美的爱情故事，也是一个气势磅礡的历史宫闱权力斗争的故事。明末清初，蒙古大帝努尔哈赤的儿子、清朝的开国功臣多尔衮，经过多年的南征北伐，成功扩充满蒙的版图，最终目的，志在一举攻破明朝的崇祯皇帝，建立大清帝国。多尔衮武功盖世，但同时铁汉柔情，钟情于满蒙第一美人大玉儿，可惜在他征战期间，其兄皇太极不但占据了本来属于他的皇位，更娶了他青梅竹马的恋人大玉儿为妃，朝廷关系由是极度紧张。