代码

package stdobj

object Std6_主构造器 {
  def main(args: Array[String]): Unit = {
    val cool = new Std6_phone("骁龙870",512)

//    println(cool.cpu)
    println(cool.rom)
    println(cool.screen)
    println(cool.ram)
  }
}

/**
 * 如果主构造器没有形参，那么就编译成无参构造方法
 *
 * @param cpu
 * @param rom
 */
class Std6_phone (cpu:String,var rom:Int)  {

  var screen:Double = _
  var ram:Int = 128

  def this() = {
    this("骁龙",128)
  }

  def this(length:Int,rom:Int) = {
    this("骁龙",rom)
  }

  def this(cpu:String,rom:Int,lenght:Int) = {
    this(cpu,rom)
  }
}

反编译