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：
注意：加密文件之后如果忘记了用来加密该文件的密码，再想恢复出原始文件就不可能了。当然，这与密码本身的复杂程度有关，要想保证文件的安全，最好采用较复杂的密码，例如混合运用字母、数字和特殊字符（如“$”符号等）。
然而必须说明的是，没有一种防范泄密的安全技术是绝对坚固的，因为密码有可能被未经授权的人获得。
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你的隐私选择 主题 亮 暗 高对比度
你的隐私选择 主题 亮 暗 高对比度
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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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