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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.新季一开始，山姆疯狂地寻找着失踪的兄弟，却毫无线索。急于找回迪恩的山姆越来越黑化，从内部动摇了好兄弟的关系。与此同时卡斯迪奥必须收拾梅塔特隆战役后的残局，因为他的宽宏大量，许多坏天使仍然逍遥在逃。卡斯迪奥将面临步步迫近的死亡威胁，而全新出现的危险局面将再次将几位主人公逼向绝路。Dean被该隐之印所控变为恶魔，Sam和Cas试图将他带回来，Crowley却试图拉拢他…… 本季故事由此展开　　《烈火金刚》中涉及到的八路军战士，都是当年吕正操的部队，很多人物都是虚构的，但是事迹却是真实的。描述同樣有艱苦歷練的三個女人之間的友情和成長的故事……A prototype object is given. Q: How can this be done? A: It's very simple. Just give a prototype class directly.妻子去世之后，抚养两个孩子的巨大责任落到了李子良的肩上，为了替妻子治病，家中早已负债累累，再也无法继续生活的李子良最终走上了借高利贷的不归路。等待他的结局只有一个，那就是利息不断的增加，最终无法偿还，与此同时，李子良和两个儿子之间的关系也越来越差。外公从外地赶来，得知了家中所发生的一切，他毅然决定帮助李子良还债。然而，高利贷公司并没有就此放过李子良，反而变本加厉，将他的同事所欠的债务也强加到了他的头上。李子良决定带着两个孩子远走高飞，没想到大儿子为了取父亲心爱的手表耽搁了，导致小儿子被黑道绑架，情况一度陷入危机。