private关键字

package day03

/**
  * private关键字
  * 类名前加private关键字是指包访问权限，只有day03这个包有访问权限
  * 构造器参数列表前加private是指伴生对象的权限
  */
private [day03] class PrivateDemo private (val gender: Int,var faceValue: Int) {
  //字段前加private，此时该字段称为私有字段
  private val name = "lulu"
  // 对象私有字段，表示在只能在本类访问
  private [this] var age = 21
  // 私有方法
  private def sayHello(): Unit = {
    println("lulu's is $age")
  }
}

object PrivateDemo {

  def main(args: Array[String]): Unit = {
    val privateDemo = new PrivateDemo(0,90)

    privateDemo.sayHello()
  }
}

//object Test3 {
//  def main(args: Array[String]): Unit = {
//    val privateDemo = new privateDemo(0,90)
//
//    println(privateDemo.faceValue)
//
//  }
//}