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Int result = cal.calate (exp);　　善美独自在街上游荡，正当她凄惶无助的时候，遇见白马王子恩浩。恩浩英俊帅气，温文尔雅，他本是孤儿，被养父收养，养父对他疼爱有加。恩浩本不愿当家族事业的接班人，但是随着养父日渐衰老，身体一天不如一天，恩浩在亲情很自由之间惟有　HTB開局50周年ドラマ「チャンネルはそのまま！」は2019年3月、北海道ローカル放送予定（全5話）、Netflix独占先行配信In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.这个大城市的少年由于搬家得以与钓鱼这种运动接触，虽然是初学者，但武藏好象为钓鱼而生一样进步神速，尤其是与钓鱼界的年轻王者“奇迹吉姆”的相遇更激起了他为钓得更好而努力的热情。当他的新女友April临产时，Stuart很快发现自己不得不依靠前妻Kate送她去医院。斯图尔特认为他“处理的情况,他被迫面对一个滥交的父亲,女儿newly-shaved头和他的惊喜返回错误的兄弟,谁是在逃避一些非常令人讨厌的类型。Public class ConnectionPool {