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Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.For simple programs, it may be easier to write a simple algorithm than to introduce a design pattern.　　在桑树墩的几次劫难中，贺子丹(王泊文饰)与罗敷共患难并意外的获得了郑王的回信。为了给家嫂治病，心比天高的贺子丹不得已卖身为奴成为公孙宇的家仆。二人为了罗敷几经较量之后，公孙宇的身份被识破，只得被迫离开淹城。而误打误撞献上郑王遗信的贺子丹却被伯淹委派监督双河双城的工程。章邯心情稍微缓和，怒目狠盯了一眼弟弟，心中迅速合计。　　江北警方追查新型毒品“天使”跨国大案，机缘巧合下，一腔热血的刘子光协助胡蓉和警方将聂万峰（刘奕君 饰）及相关毒枭一一揪出，却意外发现自己牵涉其中，且与聂万峰渊源颇深。胡蓉的亲生父亲在执行卧底任务时被杀害，也和刘子光脱不了关系。更关键的是斩草要除根，只要严世藩不死，严党的旗帜就还在。