将一个二维数组的坐标复制到另一个数组

Question

I have a 2D array freeSpace[][] that represents x , y coordinates. If the space is "not free" then I have it marked as 77 , other 1 .

I want to put all the elements marked as 77 into it's own array, with those particular array coordinates. I think it should be simple, but I just can't get the syntax correct.

Here is my code:

for (int v = 0; v < info.getScene().getHeight(); v++) {
    for (int h = 0; h < info.getScene().getWidth(); h++) {
        //System.out.print(freeSpace[h][v] != 77 ? "." : "#");
        if (freeSpace[h][v] == 77) {
            blockedCoordinates = new int[][]{{h, v}};
        }
    }
    System.out.println();
}

I have already declared the blockedCoordinates[][] array.

Most of my attempts have lead to an empty array.

Answer 1

You are doing some error while copying your data, here is why:

// assuming following definition
int[][] blockedCoordinate = new int[][]{};

for (int v = 0; v < info.getScene().getHeight(); v++) {
    for (int h = 0; h < info.getScene().getWidth(); h++) {
        //System.out.print(freeSpace[h][v] != 77 ? "." : "#");
        if (freeSpace[h][v] == 77) {
            // Make a copy
            int[][] copyBlockedCoordinate = blockedCoordinates;
            // extend the array length by 1
            blockedCoordinates = new int[copyBlockedCoordinate.length + 1][2];
            for (int i = 0; i < copyBlockedCoordinate.length; i++) {
                for (int j = 0; j < copyBlockedCoordinate[i].length; j++) {
                    blockedCoordiante[i][j] = copyBlockedCoordinate[i][j];
                }
            }
            // add new array at new or last index position in blockedCoordinate array
            blockedCoordinate[copyBlockedCoordinate.length] = {h, v};
        }
    }
    // Moake sure you write what you want to the console here to debug :)
    System.out.println();
}