小编Man*_*anu的帖子

在下面的代码示例中,我不明白为什么函数fun可以作为参数传递给方法addAction.该方法fun属于类型Unit,而该方法addAction需要类型的函数() => Unit.

如果fun是类型() => Unit,那么当我尝试添加到操作列表时,为什么编译器会抱怨fun类型？Unitfunactions = fun :: actions

package myscala

object MyScala {

  def fun() { println("fun1 executed.") }

  def addAction(a: () => Unit) {
    actions = a :: actions
  }

  var actions: List[() => Unit] = List()

  def main(args: Array[String]) {
    // the following line would produce a compiler error (found: Unit, required: () => Unit), it's OK …