Javas arrays fill with multidimensional array?lq=1

Question

Below is my 2D array: 

int[][] matrix = new int[10000][1000];

The program frequently uses: 

Arrays.fill(int[] a, int fromIndex, int toIndex, int val);

It’s to fill a row and column. When I want to fill a row 200 by 1 from 10 to end, I implement the following command: 

Arrays.fill(matrix[200], 10, 1000, 1);

I want to know how to fill a column without for(). Can anyone tell me if there is an efficient data structure that performs both operations with speed? 

Answer 1

Below is my source code for Arrays.fill():

public static void fill(int[] a, int fromIndex, int toIndex, int val) {

    rangeCheck(a.length, fromIndex, toIndex);

    for (int i=fromIndex; i<toIndex; i++)

        a[i] = val;

}

You can see that it’s a for a loop. So for columns too, you’ll implement the same way as Array.fill() code. 

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