I'm trying to create a java program using arraylists to find the median of the list. The lists can be either even or odd in length. If the list is even in length then I take the greater median value. This is what I have so far

int go( List list )
{

Collections. sort(list);

int middle = list. size() / 2;
int size = list. size() % 2;
int midplus = middle + 1;

if (size == 1)
{
return list. get(middle);
}
else
{
return list. get(midplus);
}

}

I keep getting an ArrayIndexOutOfBounds exception and I do not know why.