java - 为什么我得到的 char 数组为 "illegal start of expression"，该方法为 "class, interface, or enum expected"？

Question

我正在尝试创建一个以字符数组形式洗牌的程序。这是我的代码。问题是，它在编译时会出现甲板数组的“非法表达式开始”以及其他错误，以及 hasRemaining 方法的“预期类、接口(interface)或枚举”:

public class Blackjack
{
    public static void main(String args[])
{
            char[] deck = new char[]{'A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K','A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K','A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K'};
            char[] deck2 = new char[52];

            int i = 0;

            while (hasRemaining(deck))
            {

                Random rand = new Random();
                int r = rand.nextInt(52);
                if (deck[r] != '-1')
                {
                    deck2[i] = deck[r];
                    deck[r] = -1;
                    i++;
                }
            }

            System.out.println(deck2);

        }


        public boolean hasRemaining(char[] c)
        {
            for (int i = 0; i < c.length; i++)
            {
                if (c[i] != '-1')
                    return true;
            }

            return false;
        }

  }

Answer 1

“10”和“-1”都是无效字符常量。这会导致编译问题。