What's the logic here in array

Question

Logic behind this the out is 211 can someone tell me

class Arr
{
public static void main(String args[])
{
int [] a= {1};
int []b[]={{1}};
int [][]c[]={{{1}}};
int [][]d[][]={{{{1}}}};
System.out.println(a[0]+b[0][0]+""+c[0][0][0]+d[0][0][0][0]);
}
}

Answer 1

~ swim ~ help me out here

Answer 2

That's well details thanks ~ swim ~