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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.OnCreat () onStart () onResume () onPause () onStop () onDestroy ()　　一次大型官方活动，前DIE众人因不同原因齐集现场执行任务，刚好带着BB于附近经过的晶，因惯性捉拿正在从事不法勾当之死敌大口英，而误闯禁区，引起了连串骨牌效应，众人鸡手鸭脚，竟令警队一哥出丑当场。一哥责难下来，警队高层召开紧急会议，朗之顶头上司罗有恒为了再次踢走麻烦下属，主动提出重组DIE，将这班麻烦多多、却是无法炒鱿的废柴再度集中一起，任其自生自灭，但由于DIE原主管费SIR已退休，恒竟被众人摆上台，被逼接受主管DIE之重任。她重重地点头道：板栗哥哥划水很厉害的，他一定没事。试想一下，若是拒不救援，巨鹿城破，赵国灭亡只是时间问题。　　依然是最清蜜的爱情蜜语，依然有最珍贵的幸福，都在前方不远处，你是否已经准备好在下一秒邂逅你的清蜜恋人呢？