從基本類型int到Integer類

Question

更改我怎麼能修改此方法，以便類Integer代替原始類型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

這個怎麼樣？

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; 
}