Programming Exercise 8.5 describes how to perform matrix addition. Suppose you have multiple processors, so you can speed up the matrix addition. Implement the following method in parallel:

public static double[][] parallelAddMatrix(
double[][] a, double[][] b)

Write a test program that measures the execution time for adding two 2,000 * 2,000 matrices using the parallel method and sequential method, respectively.

Data from Programming Exercise 8.5

Write a method to add two matrices. The header of the method is as follows:

public static double[][] addMatrix(double[][] a, double[][] b)

In order to be added, the two matrices must have the same dimensions and the same or compatible types of elements. Let c be the resulting matrix. Each element cij is aij + bij. For example, for two 3 * 3 matrices a and b, c is
Write a test program that prompts the user to enter two 3 * 3 matrices and displays their sum. Here is a sample run:

b1 b12 b13 b21 bn bs b31 bya b33 a11 + bu a21 + b21 a12 + b12 a13 + b13 a22 + ba az3 + ba a12 a13 a32 a33, A31 + b3 A32 + b32 a33 + b3,