收費attetion到:
row + column - y
此操作可以返回比較小的數0
你的類應該是這樣的:
import java.util.Arrays;
public class Board {
private final int[][] board;
private final int dimention;
public static void main(final String[] args) {
final Board p = new Board(6);
for (final int[] i : p.board) {
System.out.println(Arrays.toString(i));
}
p.isUnderAttack(2, 3);
System.out.println("\n\n");
for (final int[] i : p.board) {
System.out.println(Arrays.toString(i));
}
}
public Board(final int dimention) {
this.dimention = dimention;
this.board = new int[dimention][dimention];
}
private void isUnderAttack(final int row, final int column) {
for (int y = 0; y < this.dimention; y++) {
this.board[y][row] = 1; // possible horizontal attack
this.board[column][y] = 2; // possible vertical attack
}
int staringRow = column - row;
int y = 0;
do {
this.board[staringRow][y] = 3; // diagonal SW
} while ((++staringRow < this.dimention) && (++y < this.dimention));
int staringCol = column + row;
int x = 0;
do {
this.board[x][staringCol] = 4; // diagonal NW
} while ((++x < this.dimention) && (--staringCol < this.dimention));
}
}
這是此測試的輸出:
[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, 0, 0, 0]
[0, 0, 1, 0, 0, 4]
[3, 0, 1, 0, 4, 0]
[0, 3, 1, 4, 0, 0]
[2, 2, 4, 2, 2, 2]
[0, 4, 1, 3, 0, 0]
[4, 0, 1, 0, 3, 0]
有什麼異常?的ArrayIndexOutOfBounds?你應該提供更多的信息,但問題是(很可能)很清楚。從例外的指數中,你應該能夠弄清楚。 – NeplatnyUdaj
在NW測試中,如果所討論的方格有低行,低y和高列值,則最終會得到負指數。 –