Question

我正在尝试进行二十一点模拟，下面是代码......

one_suit = [2,3,4,5,6,7,8,9,10,10,10,10,11]; #the value of the cards for blackjack
full_deck = one_suit*4; #clubs, diamonds, hearts and spades
$deck = full_deck; #start off the game with a full deck

class Player
  attr_accessor :ace_count
  attr_accessor :hand_value

  def initialize(ace_count,hand_value)
    @ace_count  = ace_count;
    @hand_value = hand_value;
  end

  def self.hit
    choice_of_card = rand($deck.length); #choose a random card out of the deck
    drawn_card = $deck[choice_of_card]; #draw that random card from the deck
    if drawn_card != 0 #if there is a card there 
     $deck[choice_of_card] = 0; #remove that card from the deck by making the space blank
     if drawn_card == 11 #if you draw an ace
      self.ace_count += 1;
     end 
     self.hand_value += drawn_card ;
    else hit; #if there is no card at that space then redraw (recursion)
    end
  end

end

player1 = Player.new(0,0);
player1.hit;

然而，当我运行它时，我得到以下输出：

NoMethodError：＃（root）at的未定义方法`hit' C：\ Users \用户恩斯特\文件\ JRuby的\ blackjack.rb：30

我做错了什么？该方法在类中定义。

Answer 1

hit是一种类方法。

如何用对象调用它？

当您编写 self .method时，它被定义为类方法。

仅编写对象或实例方法

使用def method .. end

在你的情况下

def hit
## remove `self` identifier from the attributes.
## e.g. ace_count += 1;
end

如果要调用类方法，可以使用

Player.hit和不 player_obj.hit

但我想你需要调用对象/实例方法，你可以通过删除self标识符来做。

NoMethodError：未定义的方法'hit'为

1 个答案: