命名参数和可选参数是两个比较简单的特性，对于熟悉其他编程语言的开发者来说可选参数并不陌生，为参数提供默认值时就是可选参数：
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stdin和stdout是什么，任何应用程序都有吗 关闭指定名称的进程 查找指定名称的进程
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其中，out表示仅能作为返回值的类型参数，而in表示仅能作为参数的类型参数，不过一个接口可以既有out又有in，因此既可以支持协变、支持逆变，也可以同时支持，例如：
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