Problem statement: A square matrix is a 2D array where the number of rows and columns are the same. Write a program PS3_Ex23_Square Matrix.java to read values of a square matrix of integer values and...

Problem statement: A square matrix is a 2D array where the number of rows and columns are the same. Write a program PS3_Ex23_Square Matrix.java to read values of a square matrix of integer values and check whether this matrix is (a) a diagonal matrix, or (b) an upper-triangular matrix. A diagonal matrix is a square The skeleton is provided: