java - 在子类上创建矩阵

Question

我创建了一个 Mappa 类，其中包含创建数值矩阵 Matrice 的方法，然后我创建了一个子类 MappaFermi，并在那里编写了矩阵的特定内容，但有一个错误说数组常量只能用作初始值设定项，有什么建议吗？

public class Mappa {
    private final Settore [][] settore;
    private int Matrice [][];
    private static final int X=23;
    private static final int Y=14;
    public Mappa (){
        settore = new Settore[X][Y];
        for (int i=0; i < X; i++){
            for (int j=0; j<Y; j++) {
                settore[i][j] = new Settore (i,j);
            }
        }
        Matrice = new int[23][14];
    }

    public int[][] getMatrice() {
        return Matrice;
    }

    public void setMatrice(int matrice[][]) {
        Matrice = matrice;
    }
}

public class MappaFermi extends Mappa {
    public MappaFermi() {

        Matrice={{0,0,0,0,0,0,0,0,0,3,0,0,0,3,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,0,1,0,2,0,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,2,1,2,1,2,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,1,2,2,2,1,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,3,0,1,0,3,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,1,0,0,1,0,0,1,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,2,1,0,1,0,2,1,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,2,0,0,0,0,0,1,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,1,1,1,0,0,0,1,2,1,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,1,0,1,1,1,1,1,0,2,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,2,1,0,1,0,2,1,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,0,2,0,1,0,0,0,0,0,0,0,0,0,0},
                        {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
    }
}

Answer 1

• 我们没有 Settore 类。
• Matrice 是私有(private)的，因此无法在 MappaFermi 中访问，您需要使用 setMatrice 方法。
• 你忘记了实例化new int[][]

setMatrice(new int[][]
{
    {0,0,0,0,0,0,0,0,0,3,0,0,0,3,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,1,0,2,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,2,1,2,1,2,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,1,2,2,2,1,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,3,0,1,0,3,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,1,0,0,1,0,0,1,0,0,0,0,0,0,0,0},
    {0 ,0,0,0,0,0,0,0,2,1,0,1,0,2,1,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0},
    {0 ,0,0,0,0,0,0,0,2,0,0,0,0,0,1,0,0,0,0,0,0,0,0},
    {0 ,0,0,0,0,0,0,1,1,1,0,0,0,1,2,1,0,0,0,0,0,0,0},
    {0 ,0,0,0,0,0,0,1,0,1,1,1,1,1,0,2,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,2,1,0,1,0,2,1,0,0,0,0,0,0,0,0},
    {0 ,0,0,0,0,0,0,0,0,0,2,0,1,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
});