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Set the methods in the above multiple factory method modes to static, and call them directly without creating instances.Discount: Unless otherwise specified, discount refers to the discount ratio or discount amount calculated by the seller on the basis of the original price or a certain price (such as brand counter price, commodity tag price, manufacturer's guidance price, manufacturer's suggested retail price); If you have any questions, you can contact the seller for consultation before purchasing.Lin Yilun Spokesman: 550,000 every two years (flat) Yu Chengqing Spokesman: 2.5 million every two years10. Visitor pattern(3) When Reactor monitors the occurrence of read or write events, relevant events are distributed to corresponding processors for processing. For example, the read processor will read the data through SocketChannel's read () method. At this time, the read () operation can directly read the data without blocking and waiting for the readable data to arrive.　　山崩地裂中，一座座历史悠久，风光秀美的城镇与村庄化成废墟，交通、通讯、水电全部中断，与外界失去联系……天府之国经此剧变，举国上下为之震惊。