Java 生命游戏没有正确检查邻居

Question

我设置了单元格的初始模式（initial state screenshot) for my game of life to evolve, but the code does not seem to evolve the cells correctly. Instead, it stops here，但这一代不应该是这样的。（对于给您带来的不便，我深表歉意，但我无法post状态应该是什么样子，因为缺乏声誉）。我查看了我的进化方法，但我似乎找不到问题，因为我相信所有周围的细胞都被考虑在内。非常感谢帮助。

public void setCellAlive (int row, int col){
if (row <= numberRows){
          colony [row][col] = 1;
    }else{
    System.out.println ("Index out of range.");
    }
}
public void setCellDead (int row, int col){
    if (row <= numberRows){
        colony [row][col]=0;
    }else{
         System.out.println ("Index out of range.");
    }
}
private void evolution(int i, int j) {
    int left = 0, right = 0, up = 0, down = 0;
    int topLeft = 0, topRight = 0, bottomLeft = 0, bottomRight = 0;

    if (j < colony.length - 1) {
        right = colony[i][j + 1];
        if(i>0)
            bottomRight = colony[i - 1][j + 1];
        if (i < colony.length - 1)
            topRight = colony[i + 1][j + 1];
    }

    if (j > 0) {
        left = colony[i][j - 1];
        if (i > 0)
            bottomLeft = colony[i - 1][j - 1];
        if (i< colony.length-1)
            topLeft = colony[i + 1][j - 1];
    }

    if (i > 0)
        up = colony[i + 1][j];
    if (i < colony.length - 1)
        down = colony[i - 1][j];

    int sum = left + right + up + down + topLeft + topRight
            + bottomLeft + bottomRight;

    if (colony[i][j] == 1) {
        if (sum < 2)
            setCellDead (i,j);
        if (sum > 3)
            setCellDead(i,j);
    }

    else {
        if (sum == 3)
            setCellAlive (i,j);
    }

}
public void updateColony() {
    for (int i = 0; i < colony.length; i++) {
        for (int j = 0; j < colony[i].length; j++) {
            evolution(i, j);
        }
    }
 }

Answer 1

您正在更改数组的值，然后使用新的（而不是旧的）值来决定其他单元格的状态。解决方案是每个刻度创建一个新数组，然后使用旧数组设置其值：

public void updateColony() {
    int [][] nextStep = new int[colony.length][colony[0].length];
    for (int i = 0; i < colony.length; i++) {
        for (int j = 0; j < colony[i].length; j++) {
            evolution(nextStep, i, j);
        }
    }
    colony = nextStep;
}

Java 生命游戏没有正确检查邻居

Java Game of Life not checking neighbors correctly

java

conways-game-of-life