object 主构造器 {

  class Person(var name: String = "周润发", var age: Int = 30) {
    println("调用主构造器了！")
  }

  def main(args: Array[String]): Unit = {
    val p1 = new Person
    println(s"p1:${p1.name}, ${p1.age}")
    val p2 = new Person("周星驰", 32)
    println(s"p2:${p2.name}, ${p2.age}")
    val p3 = new Person(age = 25)
    println(s"p3:${p3.name}, ${p3.age}")
  }

}