Given a square matrix, calculate the absolute difference between the sums of its diagonals.
For example, the square matrix is shown below:
1 2 3
4 5 6
9 8 9
The left-to-right diagonal = 1+5+9=15. The right to left diagonal = 3+5+9=17 . Their absolute difference is |15-17|=2.
For this problem, we need to use ‘2D list’ in Java.
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