Java Programming, Loose-leaf Version
Java Programming, Loose-leaf Version
8th Edition
ISBN: 9781337685917
Author: Joyce Farrell
Publisher: Cengage Learning
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Chapter 8, Problem 12PE

a.

Explanation of Solution

Program:

File name: “DrugTests2.java

//Define a class named DrugTests2

public class DrugTests2

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare the variables and initialize the values

        int testedEmployee;

        int week;

        final int WEEKS = 52;

        final int EMPLOYEES = 30;

        int[] counts = new int[EMPLOYEES];

        int countNeverTested = 0;

        int x;

        /*For loop to be executed until a list of randomly

        selected employees who will be tested each

        week for the next 52 weeks*/

        for(week = 1; week <= WEEKS; ++week)

        {

            //Calculate the number of times each employee is selected

            testedEmployee = 1 + (int) (Math.random() * EMPLOYEES);

            //Print the result

            System.out.print("week " + week + " Emp # " +

            testedEmployee + "      ");

            //If remainder of week % 4 equals 0

            if(week % 4 == 0)

                //Print the result

                System.out.println();

                //Increment counts

                counts[testedEmployee - 1]++;

        }

        //For loop to be executed until x exceeds 30

        for(x = 0; x < EMPLOYEES; ++x)

        {

            //Print the result

System...

b.

Explanation of Solution

Program:

File name: “DrugTests3.java

//Define a class named DrugTests3

public class DrugTests3

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare the variables and initialize the values

        int testedEmployee;

        int week;

        final int WEEKS = 52;

        final int EMPLOYEES = 30;

        int[] counts = new int[EMPLOYEES];

        int countNeverTested = 0;

        int x;

        int previousEmployee = -1;

        /*For loop to be executed until a list of randomly

        selected employees who will be tested each

        week for the next 52 weeks*/

        for(week = 1; week <= WEEKS; ++week)

        {

/*Calculate the number of times each employee is selected*/

testedEmployee = 1 + (int) (Math.random() * EMPLOYEES);

            /*If an employee number is selected

            immediately after it was already selected*/

            if(testedEmployee == previousEmployee)

            {

                //Decrement week

                week--;

                //Print the result

                System.out.println("Employee #" + testedEmployee + " was selected two weeks in a row -- making new selection");

            }

            //Else

            else

            {

                //Print the result

                System.out.print("week " + week + " Emp # " +

                testedEmployee + "      ");

                //If remainder of week % 4 equals 0

                if(week % 4 == 0)

                    //Print the result

                    System...

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5. Word FrequencyWrite a program that reads the contents of a text file. The program should create a dictio-nary in which the keys are the individual words found in the file and the values are the number of times each word appears. For example, if the word “the” appears 128 times, the dictionary would contain an element with 'the' as the key and 128 as the value. The program should either display the frequency of each word or create a second file containing a list of each word and its frequency.
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