chapter05_20180330

// 5.7 主构造器
// 主构造器的参数直接旋转在类名之后
class Person57(val name: String, val age: Int) {
  // 上边()中的内容就是主构造器的参数
}

class Person57_01(val name: String) {
  var age = 0
  def description = name + " is " + age + " years old"
}

// 5.8 嵌套类
import scala.collection.mutable.ArrayBuffer
class Network {
  class Member(val Name: String){
    val contacts = new ArrayBuffer[Member]()
  }

  private val members = new ArrayBuffer[Member]()

  def join(name: String) = {
    val m = new Member(name)
    members += m
    m
  }
}
object Network {
  val chatter = new Network()
  val myFace = new Network()
  val fred = chatter.join("fred")
  val wilma = chatter.join("Wilma")
  fred.contacts += wilma
  val barney = myFace.join("Barney")
//  fred.contacts += barney

}