Object privacy

object_privacy.rb

class BankAccount
  def initialize(customer_name, type, acct_number)
    @customer_name = customer_name
    @type = type
    @acct_number = acct_number
  end
  
  def name
    @customer_name
  end
  
  def acct_type
    @type
  end
  
  def acct_number
    @partial_num = @acct_number.split('-').join
    @partial_num = @partial_num.gsub(/\d{5}/, "*****")
  end
  
  def acct_type=(type)
    @type = type
  end
  
  def to_s
    "#{@customer_name}: #{@type}# #{self.acct_number}"
  end
end

my_acct = BankAccount.new("Scott Chiang", "Checking", "333-333-333")