Thread: Jagged array loop question

Okay I am examining a jagged array loop example from a book:

This code creates and initializes a jagged array of integers:

int number = 0;
int[][] pyramid = new int[4][];
for (int i = 0; i < pyramid.length; i++)
{
    pyramid[i] = new int[i+1];
    for (int j = 0; j < pyramid[i].length; j++)
    {
        pyramid[i][j] = number++;
    }
}

This code prints it:

for (int i = 0; i < pyramid.length; i++)
{
    for (int j = 0; j < pyramid[i].length; j++)
    {
        System.out.print(pyramid[i][j] + "  ");
    }
    System.out.print("\n");
}

They print:
0
1 2
3 4 5
6 7 8 9

It works, and i can see why and everything. My question concerns this line:

pyramid[i][j] = number++;

Why does it print 0 first?
Shouldn't pyramid[0][0] = 1? Doesn't the loop run through the first time and set pyramid[0][0] to numbers++ (numbers = 0; numbers = numbers + 1)?