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If onTouchEvent () returns false when the child view does not consume the event, then the event is passed back to its parent view's onTouchEvent (), and if the parent view does not consume the event, it is finally passed back to Activity for processing.This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:老丁拍了拍杨长帆，他一笑，皱纹就更深了，后来货和款都被河匪劫了，人就跑了。本剧的故事发生在一个现代的空军基地里。一支集结我空军飞行员精英，代号为“鹰隼大队”的战斗部队就驻扎在这里。试飞员马赫（沙溢饰）对内定进入“鹰隼大队”的肖邦（林永建饰）非常不满，两人在进行空中演习时反咬盘旋，好不惊险。肖邦最后招架无力跳伞逃生，马赫无奈忍痛击落失控的战斗机。马赫在演习中表现出的绝佳驾驶技艺和出色的临战能力，被上级看重，直接升入“鹰隼大队”。与此同时，以四名科学工作者（高亚林、殷桃、刘敏、顾宇峰饰）为首的中航服务队也进驻基地，他们将为“鹰隼大队”提供科技保障服务，让这些翱翔在天空中的“鹰隼”省去在战略战术、武器装备上的后顾之忧。然而出乎意料的是中航服务队的科学家们并不是老气横秋的学者，而是具有高科技知识和优秀外表的新一代科研人员。马赫的到来让大队的另一位飞行员伍唯涛（姬晨牧饰）心生不满，同样是试飞员出身却让马赫一来就当上了他的长机，而他只能退居到僚机的位置，两人互相不满又互不服气，再一次又一次空中演习中争强斗狠，紧咬不放，让在地面观战的人无不拍手称奇。随着中航科学家与飞行员在Differences between simple factories and factory methods: Simple factories and factory method patterns look very similar, especially specific factories in simple factories and factory methods. Simple factory, all things have been done in one place. However, the factory method creates a framework for subclasses to decide how to implement it. For example, in the factory method, the OrderPizza method creates a general framework to create pizza. The OrderPizza method relies on the factory method to create specific classes and make actual pizza. It is possible to decide what the actual products manufactured are by inheriting the factory. Simple factories do not have this flexibility.