Question

class Player

  attr_accessor :card_pile
  def initialize
    @bust = false
    @card_pile = []
  end

  def bust?
    return @cards.inject(:+) > 21
  end

end

我有这个Player类并且已经初始化了card_pile变量

class Game

  def initialize
    @players = []
  end

  def playing_game
    puts "How many players are playing? "
    players_amount = gets.chomp.to_i
      (0...players_amount).each do
        puts ("What is the players name? ")
        name = gets.chomp
        @players.push(name)
      end
      puts @players
      player = Player.new
      player.initialize
        while @card_pile.length < 2 do
          new_card = Card.new
          @card_pile.push(new_card.value)
        end
  end

我希望在下面的while循环中使用这个变量。为什么不能以我希望的方式访问它？

错误信息是：``playing_game'：私有方法initialize' called for #<Player:0x007fda53073f48 @bust=false, @card_pile=[]> (NoMethodError)

Answer 1

使用initialize创建类的新实例时，会自动调用

Player.new。您目前没有任何参数传入您的initialize方法，但您已将实例变量card_pile设置为attr_accessor，因此您可以执行此操作：

player = Player.new
while player.card_pile.length < 2 do
    new_card = Card.new
    player.card_pile.push(new_card.value)
end

如何在另一个Ruby类中访问实例变量？

1 个答案: