尝试将字段数组用作参数时出现NullPointerException

Question

所以我试图测试我的deckOfCards数组是否打算正确打印出来。这是代码

public class Deck {
    private static final String face[] = {"Ace", "Two", "Three", "Four", "Five", "Six", "Seven", 
                                            "Eight", "Nine", "Ten", "Jack", "Queen", "King"};
    private static final String suit[] = {"Spade", "Club", "Diamond", "Heart"};
    private static final Card deckOfCards[] = new Card [52];

    public Deck(){
        int suitCount = 0;
        int faceCount = 0;
        int faceValue = 0;
        for(int i = 1; i < deckOfCards.length; i++){
            deckOfCards[i].setSuit(suit[suitCount]);
            deckOfCards[i].setFace(face[faceCount], faceValue);
            suitCount++;
            faceCount++;
            faceValue++;
            if(suitCount == 3){
                suitCount = 0;
            }
            if(faceCount == 12){
                faceCount = 0;
            }
            if(faceValue == 13){
                faceValue = 1;
            }
        }
    }

正如您所看到的，我已经定义了数组中的face和suit，并且我想将它们分配给它们正确的值，但是当我尝试运行它时，我在行{{1}处得到nullPointerException }}

我似乎无法弄清楚为什么它给我这个错误，当我调试它时，它似乎初始化所有字段，但当它到达那里它崩溃。

Answer 1

您初始化数组，但不是其中的元素。你可以在循环中做到这一点：

deckOfCards[i] = new Card();
deckOfCards[i].setSuit(suit[suitCount]);