explain how it is working and what is arr[i] = new int[i + 1];

Question

public static void main(String args[])
{
int m = 3;

int arr[][] = new int[m][];

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

for(int j = 0; j < arr[i].length; j++)
{
arr[i][j] = i;

System.out.print(arr[i][j] + " ");
}

System.out.println();
}
}

}

Answer 1

i learnt c lang already now i m learning java
i learnt about loops in c but this is something different i dont understand whats happening here and how output is get calculated

Answer 2

arr[i] = new int[i + 1];
//initializing column size as i+1 of elements, for i'th row

Answer 3

But values of i one by one if u know how to use loop u can easily calculate