生活游戏，方法不起作用 [英] Game of Life, method doesnt work

问题描述

我不确定我是否会发疯，但这就是我的问题所在:

I'm not sure if I am turning mad but this is what my problem is:

我编写了《人生游戏》，并采用了一种计数"方法，该方法可以计算周围有多少个活着的田地.

I programm Game of Life and have a "countalive" method which counts how many surrounding fields are alive.

    public int countalive(Board board, int yaxis, int xaxis) { //defekt

    int living = board.getfields()[yaxis - 1][xaxis - 1] + board.getfields()[yaxis - 1][xaxis] + board.getfields()[yaxis - 1][xaxis + 1] + 
            board.getfields()[yaxis][xaxis - 1] + board.getfields()[yaxis][xaxis + 1] + board.getfields()[yaxis + 1][xaxis - 1] +
            board.getfields()[yaxis + 1][xaxis] + board.getfields()[yaxis + 1][xaxis + 1];
    return living;
}

此方法似乎工作得很好.但是当我这样做

This method seems to work perfectly fine. But when i do this

 public Board evolve(Board board) {
    Board tmpboard = board;
    System.out.println(countalive(board, 1, 3));  //I test with this. SHOULD AND IS 2!!
    int aliveneighbours = 0;
    for (int i = 1; i < board.getfields().length - 1; i++) {
        for (int j = 1; j < board.getfields()[i].length - 1; j++) {
            System.out.print("i = " +i);
            System.out.print("j = " +j +" ");
            aliveneighbours = countalive(board, i, j);
            System.out.println(aliveneighbours);

            if (aliveneighbours == 3) {
                tmpboard.getfields()[i][j] = 1;
            } else if (aliveneighbours < 2 || aliveneighbours > 3) {
                tmpboard.getfields()[i][j] = 0;
            }
        }
        System.out.println("");
    }
    return tmpboard;
}

我在控制台中得到这个:

I get this in the console:

2
i = 1j = 1 1
i = 1j = 2 1
i = 1j = 3 1
i = 1j = 4 1
i = 1j = 5 0
...

即使i = 1和j = 3应该是2而不是1.正如您所看到的，方法countalive(board，1，3)起作用，但是在for循环中它给了我不同的结果.你能找到我的错误吗?

even though i = 1 and j =3 should be 2 and not 1. As you see the the method countalive(board, 1, 3) works but in the for loop it gives me a different result. Can you find my error?

推荐答案

您正在迭代中更改单元格的活动性.您需要做的是为下一代拥有一个单独的阵列，并根据这一代对其进行更新，然后在完全了解了当前一代之后将其交换.

You are changing the aliveness of cells during the iteration. What you need to do is to have a separate array for the next generation and update that based on this generation, then swap them once you have completely looked at the current generation.

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