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此时此刻。There are two meanings here, that is, in the situation that the target customers and products are applicable to a very wide range of objects, as new salesmen, we can start from our own contacts if we want to achieve rapid results. After all, there are various connections. We can first sell the products to them, achieve certain development, and increase some confidence in our next development. Another meaning is to use the relationship of friends to build a relationship with the target customers you have targeted and launch marketing.The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:Since June 1999, an investment of 170 million yuan has taken more than two years to build the West Lake Park, which consists of three famous bridges, three water areas and four islands. The West Lake covers an area of 100 hectares, including 82.28 hectares of water, 1.72 hectares of square roads, 16 hectares of greening and more than 200 kinds of tree species.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.If you finally return from the SecondActivity page, you will return to FirstActivity at one time, and then exit the application after returning all the FirstActivities previously pressed into the stack.　　改编作家林立青同名畅销书，首部大型工地实景拍摄剧集！铁工兄弟阿祈、阿钦和板模工昌仔、怪手阿全，几个怀抱发财梦的好友，在工地里搬演一场又一场荒谬搞笑的发财戏码，这些古怪梦想述说着这群人面对的各种困境。他们发梦、梦破、满腔热血再来一个…..以噗咙共精神在尘土中不败向前。从这块地转那方围篱，帮人做工盖房，却只能望楼兴叹。有着各种人生难题的他们，努力用自己的方式活着，只是再怎么乐观，如果期待的一直事与愿违，还能怎么撑下去？