CSCI335Barriers/src/Main.java

import java.util.Random;

public class Main {
    static int SIZE = 4;
    int [][] a;
    int [][] b;
    int [][] c;
    int [][] d;

    public static void main(String[] args) {
        var main = new Main();
        main.execute();
    }

    void execute() {
        var random = new Random();
        a = new int[SIZE][SIZE];
        b = new int[SIZE][SIZE];
        c = new int[SIZE][SIZE];
        d = new int[SIZE][SIZE];
        for (int row = 0; row < SIZE; row++) {
            for (int col = 0; col < SIZE; col++) {
                a[row][col] = random.nextInt(10);
            }
        }
        for (int row = 0; row < SIZE; row++) {
            for (int col = 0; col < SIZE; col++) {
                b[row][col] = random.nextInt(10);
            }
        }

        printMatrix(a, "A");
        printMatrix(b, "B");

        for (int row = 0; row < SIZE; row++) {
            for (int col = 0; col < SIZE; col++) {
                c[row][col] = computeAtPosition(a, b, row, col);
            }
        }
        printMatrix(c, "C");

        for (int row = 0; row < SIZE; row++) {
            for (int col = 0; col < SIZE; col++) {
                d[row][col] = computeAtPosition(c, a, row, col);
            }
        }
        printMatrix(d, "D");
    }

    static int computeAtPosition(int[][] m1, int[][] m2, int row, int col) {
        int product = 0;
        for (int k = 0; k < SIZE; k++) {
            product += m1[row][k] * m2[k][col];
        }
        return product;
    }

    static void printMatrix(int[][] m1, String label) {
        System.out.println(label);
        for (int i = 0; i < SIZE; i++) {
            for (int j = 0; j < SIZE; j++) {
               System.out.print("" + m1[i][j] + "\t");
            }
            System.out.println();
        }
    }
}