I have trouble understanding this program!

[PureAwesomeness]

Im confuse with which method are those codes in green are calling.
somebody please explain to me:confused::confused::confused:
THANKS!:)

the output is
2.00,2.00,2.00
2.00, 2.00, 2.00
3.00,3.00,3.00
4.00,4.00,4.00

public class ArrayTest
{
public static void main(String args[])
{
int arr[][] = {{1,3}, {1,2,3}};
Array sub = new Array();

for(int i=0;i<arr.length;i++)
System.out.printf("%.2f\n", [COLOR="Green"]sub.avg(arr[i]));[/COLOR]
System.out.printf("%.2f\n\n", [COLOR="green"]sub.avg(arr)[/COLOR]);

for(int i=0;i<arr.length;i++)
	for(int j=0;j<arr[i].length;j++)
		[COLOR="green"]sub.change(arr[i][j]);[/COLOR]

for(int i=0;i<arr.length;i++)
System.out.printf("%.2f\n",[COLOR="green"] sub.avg(arr[i]));[/COLOR]
System.out.printf("%.2f\n\n", [COLOR="green"]sub.avg(arr));[/COLOR]

for(int i=0;i<arr.length;i++)
	[COLOR="green"]sub.change(arr[i]);[/COLOR]

for(int i=0;i<arr.length;i++)
System.out.printf("%.2f\n", [COLOR="green"]sub.avg(arr[i]));[/COLOR]System.out.printf("%.2f\n\n", [COLOR="green"]sub.avg(arr));[/COLOR]

sub.change(arr);

for(int i=0;i<arr.length;i++)
System.out.printf("%.2f\n", [COLOR="green"]sub.avg(arr[i]));[/COLOR]System.out.printf("%.2f\n\n",[COLOR="green"] sub.avg(arr));[/COLOR]
}
}

public class Array
{
public double avg(int arr[])
{
double total=0.0;
for(int i=0;i<arr.length;i++)
total += arr[i];
return (total/arr.length);
}

public double avg(int arr[][])
{
		double total=0.0;
		int cnt=0;

	for(int i=0;i<arr.length;i++)
		for(int j=0;j<arr[i].length;j++)
		{
	total += arr[i][j];
	cnt++;
		}
	return (total/cnt);
}

public void change(int arr)
{
	arr++;
}

public void change(int arr[])
{
	for(int i=0;i<arr.length;i++)
	arr[i]++;
}

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

[mtyoung]

two avg(int arr[]) and avg(int arr[][]) intake diff input

sub.avg(arr[i]) call avg(int arr[])
sub.avg(arr) call avg(int arr[][])