Question

我有类Mappa和子类MappaFermi与数组属性Sector扇区，数组的每个单元格都应该有一个名称，在类构造函数的代码中我没有任何问题命名它们（所有测试都是成功的），但是在子类构造函数中，我在尝试运行NotNull断言时得到ArrayIndexOutOfBoundsException：14。我将数组设置为protected，以便我可以在子类中使用它。

public class Mappa {
    private Name mappaName;
    protected Sector [][] sector;
    private int Matrix [][];
    private static final int X=23;
    private static final int Y=14;
    public Mappa (Name mappaName){
        this.mappaName=mappaName;
        sector = new Settore[X][Y];
        for (int i=0; i < X; i++){
            for (int j=0; j<Y; j++) {
                sector[i][j] = new Settore (i,j);
            }
        }
        Matrix = new int[23][14];
        if(mappaName==Name.FERMI){
            sector[10][8]=new Alieni(10,8);
            sector[10][9]=new Umani(10,9);
        }
        if(mappaName==Name.GALILEI||mappaName==Name.GALVANI){
            sector[10][5]=new Alieni(10,5);//i have run all tests and it was successful
            sector[10][7]=new Umani(10,7);
        }
    }
}
public class MappaFermi extends Mappa {
    public MappaFermi() {
        super(null);
        new Mappa(Name.FERMI);
        setMatrix(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}});
        for (int i=0; i < 14; i++){
            for (int j=0; j<23; j++){
                if (getMatrix()[i][j]==1){
                    sector[i][j]=new Sicuro(i,j);//this is where i get the error, if i only write `new Sicuro(i,j);` it runs successfully but i'm not storing the value in the cell of the array
                }
                else {
                    if (getMatrix()[i][j]==2){
                        sector[i][j]=new Pericoloso(i,j);   
                    }
                    else {
                        if (getMatrix()[i][j]==3){
                            sector[i][j]=new Scialuppa(i,j);
                        }
                    }
                }
            }
        }
        }


    }
public class MappaFermiTest {

    @Test
    public void testMappaFermi() {
        Mappa mappa = new MappaFermi();
        assertNotNull(mappa);
    }

}

Answer 1

扇区的维度为[23][14]，但您尝试使用迭代[i in (0..14)]``[j in (0..23)]对其进行初始化。您应该像这样初始化它：sector = new Settore[Y][X];或反X和Y值。

Answer 2

反转下面的循环语句

for (int i=0; i < 14; i++){
            for (int j=0; j<23; j++){

带

for (int i=0; i < 23; i++){
            for (int j=0; j<14; j++){

由于数组扇区的维度为[23][14];，即23 Rows and 14 Columns。这就是为什么你需要分别遍历所有行及其列

Java为数组单元分配值

2 个答案: