## BJP4 Exercise 7.20: isMagicSquare

Language/Type: Java 2D arrays
Author: Marty Stepp (on 2016/09/08)

Write a method called `isMagicSquare` that accepts a two-dimensional array of integers as a parameter and returns `true` if it is a magic square. A square matrix is a magic square if it is square in shape (same number of rows as columns, and every row the same length), and all of its row, column, and diagonal sums are equal. For example, `[[2, 7, 6], [9, 5, 1], [4, 3, 8]]` is a magic square because all eight of the sums are exactly 15.

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This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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