Dynamic Invocation in Scala

xuelanghu407

于 2016-07-30 09:55:08 发布

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分类专栏： scala 文章标签： scala

本文链接：https://blog.youkuaiyun.com/xuelanghu407/article/details/52071105

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本文通过Scala语言实现了一个动态类DynamicPerson，该类利用Scala的动态特性实现了动态字段选择、更新及方法调用的功能。文章展示了如何使用这些动态特性来模拟字段选择、字段更新和方法调用，并给出了具体的运行实例。

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import scala.language.dynamics

class DynamicPerson extends Dynamic{

  def selectDynamic(key:String):Any = {
    println(s"field '$key' selected")
  }
  def updateDynamic(key:String)(args:Any) = {
    println(s"field '$key' update with value '$args'")
  }

  def applyDynamic(name:String)(args:Any) = {
    println(s"method '$name' called with argument $args")
  }

  def applyDynamicNamed(name: String)(args: (String, Any)*) = {
    println(s"method '$name' called with arguments ${args.mkString("'", "', '", "'")}")
  }
}
object A {
  def main (args:Array[String]): Unit = {
    val person = new DynamicPerson
    person.name
    person.age = 23
    person.sayHello("hello, world.")
    person.salary(pay = 123, time = 30)
  }
}

➜  classes scala A
field 'name' selected
field 'age' update with value '23'
method 'sayHello' called with argument hello, world.
method 'salary' called with arguments '(pay,123)', '(time,30)'