Chapter 7.2, Problem 8STQ

Modified method definition of “displayResults” in Listing 7.4:

/* Modified "displayResults" method */

public void displayResults( )

{

    //Display statement for average sales per associate

    System.out.print("Average sales per associate is ");

/* Display the amount of sales by calling method "writeln" in "DollarFormat" class */

    DollarFormat.writeln(averageSales);

    //Display statement for highest sales figure

    System.out.print("The highest sales figure is ");

/* Display the highest by calling method "writeln" in "DollarFormat" class */

    DollarFormat.writeln(highestSales);

    //For next line

    System.out.println( );

    //Display statement for highest sales

System.out.println("The following had the highest sales:");

    //Compute highest sales by using "for" loop

    for (int i = 1; i <= numberOfAssociates; i++)

    {

        //Store the next sales

        double nextSales = team[i].getSales( );

        //Check condition

        if (nextSales == highestSales)

        {

/* Call "writeOutput" method to display associate name and sales amount */

            team[i].writeOutput( );

/* Display above average sales by calling "write" method in "DollarFormat" class */

DollarFormat.write(nextSales - averageSales);

System.out.println(" above the average.");

            System.out.println( );

        }

    }

    //Display given statement

    System.out.println("The rest performed as follows:");

    /* Compute rest sales using "for" loop */

    for (int i = 1; i <= numberOfAssociates; i++)

    {

        //Compute next sales

        double nextSales = team[i].getSales( );

/* If the values in getSales is not equal to highest sales, then */

        if (team[i].getSales( ) != highestSales)

        {

            /* Call "writeOutput" method */

            team[i].writeOutput( );

/* If the value of "nextSales" is greater than or equal to "averageSales", then */

            if (nextSales >= averageSales)

            {

/* Display above average by calling "write" method in "DollarFormat" class */

DollarFormat.write(nextSales - averageSales);

                //Display statement

System.out.println(" above the average.");

            }

            //Otherwise

            else

            {

/* Display below average by calling "write" method in "DollarFormat" class */

DollarFormat.write(averageSales - nextSales);

                //Display statement

System.out.println(" below the average.");

            }

            //For next line

            System.out.println( );

        }

    }

}

Explanation:

The “displayResults” method is used to display the sales reports on the screen.

• • Display statement for average sales per associate.
• • Display the amount of sales with dollar symbol by calling method “writeln()” in “DollarFormat” class.
• • Display statement for highest sales figure.
• • Display the highest sales with dollar symbol by calling method “writeln()” in “DollarFormat” class.
• • Display statement for highest sales.
• • Compute highest sales by using “for” loop.
  • ○ Compute the value of “nextSales” by using method “getSales()”.
  • ○ Check condition. If the value of “nextSales” is equal to “highestSales”, then call “writeOutput()” method in “salesAssociate” class to displays associate name and sales amount.
  • ○ Display above average sales with dollar symbol by calling method “write()” in “DollarFormat” class.
• • Compute the rest of the sales using “for” loop.
  • ○ Compute the value of “nextSales” by using method “getSales()”.
  • ○ Check condition. If the values in “getSales()” is not equal to highest sales, then call “writeOutput()” method in “salesAssociate” class to prints the name and sales amount.
    • ■ If the value of “nextSales” is greater than or equal to “averageSales”, then display above average value by calling “write()” method in “DollarFormat” class.
    • ■ Otherwise, display below average value by calling “write()” method in “DollarFormat” class.

Completed code for method definition of “displayResults”:

The complete executable code after modifying the definition of “displayResults” method is given below:

Modified “SalesReporter.java”

//Import required package

import java.util.Scanner;

//Define "SalesReporter" class

public class SalesReporter

{

  //Declare required variables

    private double highestSales;

    private double averageSales;

    private SalesAssociate[] team; 

    private int numberOfAssociates;

/* Method definition for read the number of sales associates and data for each one */  

    public void getData( )

    {

        //Create object for scanner class

        Scanner keyboard = new Scanner(System.in);

        //Read the number of scales associates

System.out.println("Enter number of sales associates:");

        numberOfAssociates = keyboard.nextInt( );

        //Create object for "SalesAssociate" class

team = new SalesAssociate[numberOfAssociates + 1];

        //Read data for each sales associates

        for (int i = 1; i <= numberOfAssociates; i++)

        {

            team[i] = new SalesAssociate( );

System.out.println("Enter data for associate " + i);

            team[i].readInput( );

            System.out.println( );

        }

    }

/* Method definition for computes the average and highest sales figures */

    public void computeStats( )

    {

        double nextSales = team[1].getSales( );

        highestSales = nextSales;

        double sum = nextSales;

        for (int i = 2; i <= numberOfAssociates; i++)

        {

            nextSales = team[i].getSales( );

            sum = sum + nextSales;

            if (nextSales > highestSales)

highestSales = nextSales; //highest sales so far.

        }

        averageSales = sum / numberOfAssociates;

    }

    /* Modified "displayResults" method */

    public void displayResults( )

    {

//Display statement for average sales per associate

System...