上一节理解了工厂模式.其代码原理如下: <?php abstract class ApptEncoder{ abstract function encode(); } class BloggsApptEncoder extends ApptEncoder{ function encode(){ return "data encode farmat"; } } abstract class CommsManager{ abstract function getHeaderText(
Host is MasterThis is a fundamental USB concept. There is exactly onemaster in a USB system: the host computer. USB devicesrespond to host requests. USB devices cannot send information among themselves, as they could if USB were apeer-to-peer topolog