"Command"" 顾名思义 "命令""指令"的意思
Command 模式在现实当中的场景
例如:某一天,校长在教室走廊碰到了 高三一班的王老师,校长对王老师说":叫 高三一班的班长到他办公室去"(相当于命令),王老师接到校长的命令后,立即走到高三一班教室里面(执行校长的命令) 然后通知高三一班班长到校长办公室去.班长(命令接收者)听到命令后,就去了校长办公室. 通过这个场景大家应该对Command 模式有点印象了.
代码如下:
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输出:去校长办公室。
综上说述一个简单的命令模式就呈现在大家的面前,但仔细想下,从这个场景来看,有点象委托的味道,如校长委托王老师叫高三一班的的班长去他办公室.但不能与此委托等同.