Question

I want to read the following into a 2d jagged array:

3
7 4
2 4 6
8 5 9 3

I need to increase the column size on every input. I’m not exactly sure how to do it.

My code is as follows:

int col = 1;
int[][] values = new int[rows][col];
for(int i = 0; i < values.length; i++){
  for(int j = 1; j < col; j++)
  {
     values[i][j] = kb.nextInt();
     col++;
  }
}

Answer 1

This should do it.

int[][] values = new int[rows][];
for(int i = 0; i < values.length; i++)
{
    values[i] = new int[i+1];

    for(int j = 0; j < values[i].length; j++)
    {
        values[i][j] = kb.nextInt();
    }
}

Basically, you start by defining how many rows your 2d array should have.

In the for loop, you define the 1d array for each row with its length.