13、Scala中的模式匹配与隐式参数

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于 2025-07-14 11:16:06 发布

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分类专栏： Scala编程：从入门到精通文章标签： Scala 模式匹配隐式参数

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Scala中的模式匹配与隐式参数

1. 密封类层次结构与详尽匹配

在Scala中，密封类层次结构可以实现详尽的模式匹配。例如，我们定义一个密封的抽象基类 HttpMethod 来表示HTTP允许的消息类型或“方法”：

sealed abstract class HttpMethod() {
    def body: String
    def bodyLength = body.length
}
case class Connect(body: String) extends HttpMethod
case class Delete (body: String) extends HttpMethod
case class Get    (body: String) extends HttpMethod
case class Head   (body: String) extends HttpMethod
case class Options(body: String) extends HttpMethod
case class Post   (body: String) extends HttpMethod
case class Put    (body: String) extends HttpMethod
case class Trace  (body: String) extends HttpMethod

def handle (method: HttpMethod) = method match {
  case Connect (body) => s"connect: (length: $