9. 线程

一

1.1

可以使用 call by name notation: 忽略 (),

object A
{
  def runInThread(block: => Unit)
  {
    new Thread {
      override def run() { block }
    }.start()
  }
  //这个是中规中矩的写法，调用的时候语法不整洁
  def runInThread2(block: ()=> Unit)
  {
    new Thread {
    //************注意调用时候有括号
      override def run() { block() }
    }.start()
  }
  def main (args:Array[String]): Unit =
  {
      runInThread { println("Hi"); Thread.sleep(10000); println("Bye") }
      runInThread2 { () => println("Hi"); Thread.sleep(10000); println("Bye") }
  }
}