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Lower elevator tab Shift + Up arrow Shift + Up arrow-For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.An event can be active (open) or stopped (closed). Active means that the event scheduler checks whether the event action must be called. Stopping means that the declaration of the event is stored in the directory, but the scheduler does not check whether it should be called. After an event is created, it becomes active immediately, and an active event can be executed once or more times.His mother now does not allow Zhao Mucheng to travel far away and has to go home on time at night. He promised his mother that he would never leave his hometown again.黑云压顶、山雨欲来，一场惊心动魄的厮杀就在眼 欢喜姻缘前：名捕（张国立饰）一路猛追，终于将威震八方的“江洋大盗”（陈亚兰饰）逼到了绝境，随着隆隆的雷声和铿锵的鼓点两人兵刃相见。刹时，只见风卷残云，日月变色，天昏地暗，一剑挑飞了“江洋大盗”的面纱盖头，定睛一看，大惊失色，此“江洋大盗”不是别人，正是自己的未婚妻！目瞪口呆之际，脚下一滑，名捕直向万丈深渊栽下去……幸亏名捕的未婚妻眼疾手快，一把将其抓住！眼见未婚妻身后石块松动，摇摇欲坠，名捕要陈亚兰快快松手，然后痴情女子哪肯舍弃心爱之人，于是乎，一阵轰响，二人同时坠入深谷。两朵样云扶摇升起，天籁之声，余音袅袅…左都御史庞家更是要为外孙讨公道。