Scala的内部类

class Car1{
  private var speed = 0

  val color = "red"
  //内部类：可以访问类的私有成员！用它来操作类的私有成员，封闭性更好！
  class Engin(var maxSpeed:Int) {
    def acc(): Unit = {
      speed += 10
      if (speed > maxSpeed) {
        speed == maxSpeed
      }
      println("speed", speed)
    }

    def sub(): Unit = {
      speed -= 10
    }
  }

  override def toString: String = {
    s"当前的速度是 ${speed}"
  }
}
object lly {
  def main(args: Array[String]): Unit = {
    val c = new Car1()
    var engin = new c.Engin(120)
    engin.acc()
    engin.acc()
    println(c)
    engin.acc()
    println(c)
  }
}

class Car3(var r:Double){
  //属性
  //方法
  //内部类

  //内部对象
  object util{
    val PI = 3.14
    def getArea(r:Double): Double = {
      PI * r * r
    }
    def getL():Double = {
      2 * PI * r
    }
  }
}
object yyy {
  def main(args: Array[String]): Unit = {
    //使用内部对象
    val car = new Car3(12)
    val res = car.util.getL()
    println(res)
  }

}

class Car{
  def run(): Unit = {
    
  }
}
object zzx {
  def main(args: Array[String]): Unit = {
//    var car = new Car3()
//    car.run()
    //匿名类：没有名字的类！
    //特点：
    //    1.没有名称
    //    2.代码不能重用，只能用一次！如果需要创建对象，则需要重新写一遍！
    var car1 = new {
      var color = "white"

      def run(): Unit = {
        println("run...")
      }
    }
    var car2 = new {
      var color = "white"

      def run(): Unit = {
        println("run...")
      }
    }
    car1.run()
  }

}