Using Java write a short snippet of code that calculates the following (note: the diagonal numbers are highlighted in bold blue NOT red) please comment the code as well.

In the 20x20 grid below, four numbers along a diagonal line have been marked in red 08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 2 50 77 91 08 69 48 04 56 62 00 30 03 49 13 36 65 52 95 23 04 60 11 42 69 24 68 56 32 56 71 37 02 36 91 22 31 6 71 51 67 63 89 4 92 36 54 22 40 40 28 66 33 13 80 33 84 20 35 17 12 50 32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70 67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21 24 55 58 05 66 73 99 26 97 17 78 78 96 83