Creates a Matrix Class in Java

with private Int Column and 2d array as variables.

with following three methods

- public Matrix multiply(Matrix y)

A method called multiply that will perform matrix multiplication. The method will be called as follows: x.multiply(y) where x and y are Matrix objects. Thus, the method will take a matrix object as the input parameter and will perform multiplication by considering the object x that is calling the function as the first matrix and the matrix object y passed to the function as the second matrix. (Do NOT interchange this order as matrix multiplication is NOT commutative) So you need to perform x*y and return the product matrix object. If multiplication cannot be performed on the two matrices, print the contents of MULTIPLY_ERROR string and return null. If a null object is passed to the method, it should just return null.

- public Matrix(int row, int column)

The constructor for Matrix class which takes the integer inputs row and column and will be used for initializing your instance variables row, column and the 2D integer array. For example, creating an object as new Matrix(2,2) should create a matrix with 2 rows and 2 columns. If the parameters passed are invalid (negative numbers) then initialize your instance variables row, column to 0 and the 2D integer array to null

- public Matrix(Matrix mat)

The deep copy constructor for Matrix class which takes the Matrix object mat as an input and creates a deep copy of the matrix. The purpose of a deep copy constructor is to copy the contents of one object to another object and changing the copied object shouldn't change the contents of the original.