Generating Random Numbers

Quest: a trivial exercise in generating random integers that one can class as either zero, even or odd between zero (inclusive) and eleven exclusive. After these integers, nine in all, are generated, classification is done and the result of the number of zeros, evens and odds in the total numbers generated is then printed to the screen.

Find: i”ll use an instance of a RandGenerator class to reach the above goal. Importing the class Random from the package, java.util, the following fields are declared by our RandGenerator class:

  import java.util.*;
  
  public class RandGenerator {
        //the array to hold the numbers generated
        private int[] boxArray = new int[9];
        //declaring an instance of our random number class
        private Random rand;
        //counters for the integers generated
        private int oddCount=0, evenCount=0, zeroCount=0;

we'll make use of two methods, a generator() that uses the Random class to generate nine integers from between zero (0) and ten (10) and then inserting the integers into an array.

        //method that generates random numbers as int values
        private void generator(){
             rand = new Random();
             //this for loop generates 9 consecutive random numbers
             for (int i =0; i<9; i++){
                  //get a random number between 0 and 11 exclusive
                  //and store in an array of ints
                  boxArray[i] = rand.nextInt(11);
             }
        }

Another method, probing(), accesses the array for its int values, maps each int trivially to either a zero, even or odd class and increases the count for each class so mapped. Note that the mapping is assumed. Finally, this class prints out the numeric value of the numbers generated for each of zero, even or odd classes from accessing the array.

        //method that evaluates the numeric count of the integers
       //generated randomly according to a zero, even and odd class
       private void probing(){
             //starting from the first to the last element in the array find out 
            //what integer was generated
            for (int i=0; i‹boxArray.length; i++){
                 int take = boxArray[i];
                 //if integer generated is zero, increase zero count
                 if (take == 0) {
                   zeroCount++;
                 }
                 //if even integer generated, increase even count
                 //by one
                 else if (take % 2 == 0){
                    evenCount++;
                 }
                 //otherwise odd integer generated, increase count
                 else {
                   oddCount++;
                 }
            }
   //print out the result of the count values
   System.out.println("Number of odd values"+ 
                    "generated were "+ oddCount+" .");
   System.out.println("Number of even values"+ 
                    "generated were "+evenCount+" .");
   System.out.println("The zeros generated were" +
                    zeroCount+" in number.");
  }
  

Finally, you can run this code by instantiating the class and just calling the two methods.

  public static void main(String[] args){
            RandGenerator random = new RandGenerator();
            random.generator();
            random.probing();
  }

Thinking of another quest for next blog. Promise it'll be great