private[this]例子

package Test22
//银行账户
class BankAccount(private[this] var balance:Int){
  def showMoney():Unit={
    println(s"现在的余额是:${balance}")
  }
  def deposit(money:Int):Unit={
    balance+=money
  }
  def withdraw(money:Int):Unit= {
    if (money <= balance)
      balance -= money
  }
  //转账
  def transfer(to:BankAccount,money:Int):Unit={
    //A--200-->B
    //A减少 B 增加

  }
}
object Test22_2 {
  def main(args: Array[String]): Unit = {
    var xiaohua=new BankAccount(100)
    //存入200
    xiaohua.deposit(200)
    //存入1500
    xiaohua.withdraw(1500)
    //转账给小明
    xiaohua.showMoney()
    //   println(xiaohua.balance)
  }

}
package Test22
//银行账户
class BankAccount(private var balance:Int){
  def showMoney():Unit={
    println(s"现在的余额是:${balance}")
  }
  def deposit(money:Int):Unit={
    balance+=money
  }
  def withdraw(money:Int):Unit= {
    if (money <= balance)
      balance -= money
  }
  //转账
//  def transfer(to:BankAccount,money:Int):Unit={
//    //A--200-->B
    //A减少 B 增加

 // }
}
object Test22_2 {
  def main(args: Array[String]): Unit = {
    var xiaohua=new BankAccount(100)
    //存入200
    xiaohua.deposit(200)
    //存入1500
    xiaohua.withdraw(1500)
    //转账给小明
    xiaohua.showMoney()
    //   println(xiaohua.balance)
  }

}

//private[p1]:表示，这方法在p1这个包中。是可以访问的
package p2 {
  class C() {
    private[p2] def test(): Unit = {
      println("test")
    }
  }

  object Test22_4 {
    def main(args: Array[String]): Unit = {
      var c1 = new C()
      c1.test()
    }

  }
}