我想用一个char值随机填充2D数组中的单个元素？

Question

如何从2D数组中随机选择一个元素，并用char＆＃39; M＆＃39;填充该元素？

Answer 1

你在找这样的东西吗？

// Your array of Char with the length of 5 by 5
char[][] arrayOfChar = new char[5][5];

// Generating a radom number with min being 0 and max being length - 1
Random rand = new Random();
int x = rand.nextInt(arrayOfChar[0].length);
int y = rand.nextInt(arrayOfChar[1].length);

// Random position in array assigned M
arrayOfChar[x][y] = 'M' ;

如果您想要int数组

// Your array of int with the length of 5 by 5
int[][] arrayOfInt = new int[5][5];

// Generating a radom number with min being 0 and max being length - 1
Random rand = new Random();
int x = rand.nextInt(arrayOfInt[0].length);
int y = rand.nextInt(arrayOfInt[1].length);

// Random position in array assigned number 8
arrayOfInt[x][y] = 8 ;

Answer 2

也许是这样的？

public class random2DChar {
    public static void main(String args[]) {
        char[][] char2DArr = new char[10][10];
        Random random = new Random();
        int x = random.nextInt(char2DArr.length);
        char2DArr[x][x] = 'M';
        System.out.println(Arrays.deepToString(char2DArr));
    }
}