Chapter 8 Exercise 22, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

*8.22 (Even number of 1s) Write a program that generates a 6-by-6 two-dimensional matrix filled with 0s and 1s, displays the matrix, and checks if every row and every column have an even number of 1s.

public class ProgrammingEx8_22 {
 
 public static void main(String[] args) {
  int array[][] = new int[6][6];
  fillArray(array);
  displayArray(array);
  calRow(array);
  calCol(array);
 }
 
 public static void calCol(int array[][]) {
 
  int intSum = 0;
 
  for (int i = 0; i < array.length; i++) {
   for (int j = 0; j < array[i].length; j++) {
    intSum += array[j][i];
   }
 
   if (intSum % 2 == 0) {
    System.out.println("Column " + i + " has even number of 1.");
   } else {
    System.out.println("Column " + i + " has odd number of 1.");
   }
  }
 
 }
 
 public static void calRow(int array[][]) {
 
  int intSum = 0;
 
  for (int i = 0; i < array.length; i++) {
   for (int j = 0; j < array[i].length; j++) {
    intSum += array[i][j];
   }
 
   if (intSum % 2 == 0) {
    System.out.println("Row " + i + " has even number of 1.");
   } else {
    System.out.println("Row " + i + " has odd number of 1.");
   }
 
  }
 
 }
 
 public static void fillArray(int array[][]) {
 
  for (int i = 0; i < array.length; i++) {
   for (int j = 0; j < array[1].length; j++) {
    array[j][i] = intRandom(0, 1);
   }
 
  }
 }
 
 public static int intRandom(int lowerBound, int upperBound) {
  return (int) (lowerBound + Math.random()
    * (upperBound - lowerBound + 1));
 }
 
 public static void displayArray(int array[][]) {
 
  for (int i = 0; i < array.length; i++) {
   for (int j = 0; j < array[0].length; j++) {
    System.out.print(array[i][j]);
   }
 
   System.out.println("");
  }
 }
}