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你以为害死了花无缺，我就会感激你吗？苏樱同样一脸怒意的看着小鱼儿。The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.蒲俊摇头道：大王说哪里话，这些都是我们该做的。板栗抬起眼皮看了他们一眼，冷笑道：有些人就是讨人嫌，叫人忍不住想揍他。Reduce flap adjustment left parentheses left parentheses-Qingdao is a relatively developed area for private lending. Therefore, the private lending business is relatively mature for a long time. P2P under Qingdao mode basically needs real estate as collateral, while cars and others are not allowed to be used as collateral to control risks. When investigating several large P2P websites, it was found that the collateral required by them was all a real estate certificate, and it was required to be a real estate in Qingdao that could be seen and accurately valued. Therefore, P2P enterprises in Qingdao basically do not do business with outsiders. Behind the strict mortgage system is the lender's low-risk protection. Therefore, one of the biggest characteristics of Qingdao model is that it has low risks and low non-performing loan ratio. Qingdao P2P mode has the lowest risk, and P2P enterprises also bear the greatest responsibility. Therefore, Qingdao P2P enterprises are typical "composite intermediary". However, as its enterprises are all transformed from private lending agencies, Therefore, they do not attach importance to the role of the network. Most of its website pages do not have personal loan information or loan information, It is the company's self-promotion, which aims to allow borrowers or lenders to meet and discuss with their companies. Moreover, Qingdao only does local business, which limits the scale expansion of intermediary enterprises. As the main feature of P2P enterprises is to operate on the basis of the network, the Qingdao model is not a typical P2P credit in a certain sense. Qi Fang Mode: The student aid platform mode Qi Fang P2P has more public welfare color, but it also has considerable profits. Facing the serious economic stratification of college students, Qi Fangwang has targeted its target group at paying tuition fees but needing to participate in education, training and investment outside the university.