Question

根据,Schala方法属于一个类别。然而,如果我界定了REPL的一种方法,或用我当时使用的卡片进行的描述,那么该方法属于哪一类?

scala> def hoho(str:String) = {println("hoho " + str)}
hoho: (str: String)Unit

scala> hoho("rahul")
hoho rahul

In this example, what class does the method belong to ?

Answer 1

REPL将你的所有发言(实际上改写了你的发言稿)以自动作成。如果你使用<条码>-X印:typer 备选办法印刷中间代码,你可以认为该代码是有效的:

scala> def hoho(str:String) = {println("hoho " + str)}
[[syntax trees at end of typer]]// Scala source: <console>
package $line1 {
  final object $read extends java.lang.Object with ScalaObject {
    def this(): object $line1.$read = {
      $read.super.this();
      ()
    };
    final object $iw extends java.lang.Object with ScalaObject {
      def this(): object $line1.$read.$iw = {
        $iw.super.this();
        ()
      };
      final object $iw extends java.lang.Object with ScalaObject {
        def this(): object $line1.$read.$iw.$iw = {
          $iw.super.this();
          ()
        };
        def hoho(str: String): Unit = scala.this.Predef.println("hoho ".+(str))
      }
    }
  }
}

So your method hoho is really $line1.$read.$iw.$iw.hoho. Then when you use hoho("foo") later on, it ll rewrite to add the package and outer objects.

附加说明:关于字母,-Xprint:typer(-Xprint:parser/code>)显示,该代码在main(args:Array[String]的正标栏内封顶内。可查阅<代码>args或argv。

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