java - 多维数组，如何检查与某些单元格相邻的所有相邻图 block ？

Question

我创建了一个 12x12 的网格，在这个网格中我创建了“受感染”的方 block ，当一个受感染的方 block 被其他受感染的方 block 包围时，被包围的单元格变成患病的方 block 。我想知道是否有一种很好的方法来检查相邻的边界单元格的值？

public static void diseaseTiles() {
    int i, j;
    for(i = 0; i < 12; i++) {
        for(j = 0; j < 12; j++) {
            if(myGrid[i][j] == 'I'){
                int left, right, up, down;
                if(i == 0) {
                    left = 1;
                }
                if(i == 11) {
                    right = 1;
                }
                if(j == 0) {
                    up = 1;
                }
                if(j == 11) {
                    down = 1;
                }
                //this is where I've gotten stuck
                //I was going to use the above int's to determine
                //whether or not the adjacent tile in that direction
                //should be checked (they're the border of the grid)
            }
        }
    }
}

Answer 1

您可以利用短路评估来检查细胞是否被感染:

boolean leftInfected = (i!=0) && myGrid[i-1][j]=='I';
boolean rightInfected = (i!=11) && myGrid[i+1][j]=='I';
boolean topInfected = (j!=0) && myGrid[i][j-1]=='I';
boolean bottomInfected = (j!=11) && myGrid[i][j+1]=='I';

之后，您可以检查是否所有四个都被感染:

if (leftInfected && rightInfected && topInfected && bottomInfected) {
    myGrid[i][j] = 'D';
}