take last row first item from two-dimensional java : 

I am trying to take take first item of the last row which in this case would be 5, but i cant find how to get this.

    int[][] arr = { { 2, 4, 5, 1 }, { 4, 8, 7, 1 }, { 5, 9, 2, 20 } };`

this is what ive tried but this gives me the last item of the row.

`String[] lastNum = arr[arr.length - 1];
System.out.println(lastNum[lastNum.length-1]);`