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我宣布两张牌:Java数组,NullPointerException?
Card card1 = new Card('3', Card.Suit.clubs);
Card card2 = new Card('T', Card.Suit.diamonds);
这工作:
Hand hand1 = new Hand();
hand1.takeCard(card1);
但为什么这个不行?它给了我一个NullPointerException在第二行:
Hand[] hand = new Hand[2];
hand[0].takeCard(card2);
它的工作!非常感谢你! – 2013-03-02 03:05:31