java线程[main]（挂起（未捕获异常ArrayIndexOutOfBoundsException））

Question

这是一个简单的程序来创建一个对象卡（西装和排名）。Eclipse调试器将错误指向第16行（字符串s=ranks[this.rank]+“+suits[this.suit]；”中的“+”）

public class Card 
{
    private int rank;
    private int suit;

    public Card(int rank, int suit) 
    {
        this.rank = rank;
        this.suit = suit;
    }
    public String toString() {
        String[] ranks = {null, "Ace", "2", "3", "4", "5", "6",
                   "7", "8", "9", "10", "Jack", "Queen", "King"};
        String[] suits = {"Clubs", "Diamonds", "Hearts", "Spades"};
        String s = ranks[this.rank] + " of " + suits[this.suit];
        return s;
    }
    public static void main(String args[])
    {
        Card a=new Card(1,11);
        System.out.println(a);
    }

Answer 1

因为在《西服》中只有四个价值观。索引：0，1，2，3