使用嵌套的 for 循环为二维数组赋值

Question

我想通过使用嵌套的 for 循环将值迭代到我的 2D 数组，但这是我目前所拥有的。我认为它确实填充了我的二维数组，但没有填充我想要的数字。我希望它从 2 开始填充 2 的幂。所以我的结果看起来像： 2, 4, 8, 16、32、64……等等，直到我的行和列完成。

我的代码：

public class RowsSum {
    public static void main(String[] args) {
        int[][] nums = new int[5][3]; //declaring a 2D array of type int
        for (int i = 0; i <= nums.length; i++) {
            for (int j = 0; j < nums[0].length; j++) {
                nums[i][j] = (i * nums[0].length) + j + 1;
                System.out.print(nums[i][j] + "\t");
            }//closing inner loop
            System.out.println("");
        }// closing nested for loop
    }// closing main method
}//closing class

Answer 1

这应该有效：

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代码A：这里，我只是将数组内的值设置为2的数组中位置的幂，从1开始。为了得到位置，我将当前col索引乘以每行的长度加上当前行中的索引。这只是一种无需在循环外创建新的计数变量，然后在内循环中每次都递增它的方法，尽管如果您愿意，也可以这样做。