从原始类型 int 更改为 class Integer

Question

如何修改此方法以便使用 class Integer 而不是原始类型 int？

int[][] fillMatrix() {
    int[][] matrix = new int[5][4];
    for (int row = 0; row < 5; row++)
        for (int column = 0; column < 4; column++)
            matrix[row][column] = row * column;
   return matrix;
}

Answer 1

这个怎么样？

Integer[][] fillMatrix() {
Integer[][] matrix = new Integer[5][4];
for (int row = 0; row < 5; row++)
    for (int column = 0; column < 4; column++)
        matrix[row][column] = row * column;
 return matrix;
}