Program:

Changes in definition of the method "writePositive()" in "DollarFormat" class:

File name: DollarFormat.java:

//Define the class

public class DollarFormat

{

/*Refers the textbook of Listing 6.14*/

//Define the method "writePositive()"

private static void writePositive(double amount)

{

//Assign the value to the variable "allCents"

long allCents = Math.round(amount * 100);

//Assign the value to the variable "dollars"

long dollars = allCents / 100;

//Assign the value to the variable "cents"

long cents = allCents % 100;

//Print the dollars

System.out.print(dollars);

//Print the dot

System.out.print('.');

//Check the condition

if (cents < 10)

//True, print the cents

System.out.print('0');

System.out.print(cents);

}

//Define the method "writeln()"

public static void writeln(double amount)

{

//Call the method "write()"

write(amount);

//Print the new line

System.out.println( );

}

}

File name: DollarFormatDriver.java:

//Import necessary header files

import java.util.Scanner;

//Define the class

public class DollarFormatDriver

{

//Define the "main()" method

public static void main(String[] args)

{

//Declare the necessary variables

double amount;

String ans;

//Create object for "Scanner()"

Scanner keyboard = new Scanner(System...