CSC-111 Solution to the Even Ones Homework

EvenOnes.java

/*
 * Name: Prof. A.C. Silvestri
 * Date: 12/3/2018
 * Course Number: CSC-111
 * Course Name: Introduction to Java Programming
 * Problem Number: Two Dimensional Array Assignment
 * Email: silvestri@stcc.edu
 * Description: Fix the program from the titled video "LiangCh08 - Even Number Of Ones," to run in a loop until it finds the correct solution
 */

import java.util.Scanner;

public class EvenOnes {

	private static void report(int[][] matrix, int count) {
		if (!hasEvenOnes(matrix))
			System.out.printf("Could not find a solution in %d attempts\n", count);
		else {
			System.out.println("Matrix:");
			for (int i = 0; i < matrix.length; i++) {
				for (int j = 0; j < matrix[i].length; j++)
					System.out.print(matrix[i][j]);
				System.out.println();
			}
			System.out.println("Number of iterations to generate: " + count);
		}
	}

	// ************************************************************************

	private static boolean hasEvenOnes(int[][] matrix) {
		for (int i = 0; i < matrix.length; i++) {
			int oneCount = 0;
			for (int j = 0; j < matrix[i].length; j++)
				if (matrix[i][j] == 1)
					oneCount++;
			if (oneCount % 2 != 0)
				return false;
		}
		for (int j = 0; j < matrix[0].length; j++) {
			int oneCount = 0;
			for (int i = 0; i < matrix.length; i++)
				if (matrix[i][j] == 1)
					oneCount++;
			if (oneCount % 2 != 0)
				return false;
		}
		return true;
	}

	// ************************************************************************

	private static void generateMatrix(int row, int col) {
		final int MAXTRIES = 10000;
		int matrix[][] = new int[row][col];
		int iterationCount = 0;
		do {
			for (int i = 0; i < matrix.length; i++) {
				for (int j = 0; j < matrix[i].length; j++)
					matrix[i][j] = (int) (Math.random() * 2);
			}
			iterationCount++;
		} while (!hasEvenOnes(matrix) && iterationCount < MAXTRIES);
		report(matrix, iterationCount);
	}

	// ************************************************************************

	private static void process(Scanner sc, String[] args) {
		System.out.println();
		System.out.print("How many rows would you like in the matrix? ");
		int row = sc.nextInt();
		System.out.print("And how many columns? ");
		int col = sc.nextInt();
		generateMatrix(row, col);
		sc.nextLine();
	}

	// ************************************************************************

	private static boolean doThisAgain(Scanner sc, String prompt) {
		System.out.print(prompt);
		String doOver = sc.nextLine();
		return doOver.equalsIgnoreCase("Y");
	}

	// ************************************************************************

	public static void main(String[] args) {
		final String TITLE = "Even Number Of Ones Matrix Generator V1.0";
		final String CONTINUE_PROMPT = "Generate another matrix? [y/N] ";

		System.out.println("Welcome to " + TITLE);
		Scanner sc = new Scanner(System.in);
		do {
			process(sc, args);
		} while (doThisAgain(sc, CONTINUE_PROMPT));
		sc.close();

		System.out.println();
		System.out.println("Thank you for using " + TITLE);
	}

}