scala private[this] , spawn方法

private demo.scala

package test
 
object Simon_test {
	class My_1{
		private[this] val name = "Simon"
			
		def showName(my:My_1){
			println(my.name) //Error
			println(this.name) //OK
		}
	}
	class My_2{
		private val name = "Simon"
			
		def showName(my:My_2){
			println(my.name) //OK
			println(this.name) //OK
		}
	}
	class My_3{
		private[test] val name = "Simon"
		protected val age = 2	
		def showName(my:My_3){
			println(my.name) //OK
			println(this.name) //OK
		}
	}
        class My_4 private(a:Int){
             
        }
        object T extends My_3{
             val a =age +2//ok
             val b = new My_3().age //Error
        }
        object My_4{
         new My_4(2) //ok
        }
	def main(args : Array[String]) : Unit = {
		val my1 = new My_1()
		val my2 = new My_2()
		val my3 = new My_3()
		println(my1.name) //Error
		println(my2.name) //Error
		println(my3.name) //OK
                val my4 = new My_4() //Error
	}
}

spawn.scala

def spawn(p: => Unit) = { 
　　val t = new Thread() { override def run() = p } 
　　t.start() 
　　}

private[test], protected[test] 中的【x】 是控制x包是否可以访问 该成员。