Create a class named Invoicing that includes three overloaded computeInvoice() methods for a book store: see pages 196 for examples… The 8% tax should be defined as a constant. 1. When computeInvoice() receives a single parameter, it represents the price of one book ordered. Add 8% tax and display the total due.
2. When computeInvoice() receives two parameters, they represent the price of a book and the quantity ordered. Multiply the two values, add 8% tax, and display the total due.
3. When computeInvoice() receives three parameters, they represent the price of a book, the quantity ordered, and a coupon value. Multiply the quantity and price, reduce the result by the coupon value, and then add 8% tax and display the total due.
Create a driver class named TestInvoice with a main() method that tests all three overloaded methods using the following data: Price $24.95 Price, $17.50, quantity 4, Price $10.00, quantity 6, coupon $20.00 Output printed to Eclipse Console:
Price $26.95
Price $76.95
Price $43.20

Follows are the method to this question:

class Invoicing  //defining a class Invoicing  

{

  public static final double Tax = 8.0; //defining static variable Tax that holds a value

  public static double Total;//defining a double variable Total

  public void computeInvoice(double p1)//defining method computeInvoice that take double parameter

  {

      Total = p1 + p1 * (Tax / 100);//defining double variable Total that holds Price value

      System.out.printf("Price $%.2f\n" , Total);//print calculated value

  }

  public void computeInvoice(double p2, int q)//defining method computeInvoice that takes integer and double parameter

  {

      Total = p2 * q;//use Total variable that calculate Price with Tax

      Total = Total + (Total * (Tax/ 100));//calculate taxes on Total

      System.out.printf("Price $%.2f\n" , Total);//print calculated value

  }  

  public void computeInvoice(double p3, int q, double c)//defining method computeInvoice that takes one integer and two-double parameter  

  {

      Total = p3 * q;//use Total to calculate Total price

      Total = Total - c;//remove coupon amount from Total amount

      Total = Total + (Total * (Tax/ 100));//calculate taxes on Total

      System.out.printf("Price $%.2f\n" , Total);//print calculated value

  }

}

public class TestInvoice  //defining Main class TestInvoice  

{

  public static void main(String[] ar)//defining main method  

  {

      Invoicing  obm = new Invoicing ();//creating Invoicing class object obm

      obm.computeInvoice(24.95);//calling method computeInvoice

      obm.computeInvoice(17.5, 4);//calling method computeInvoice

      obm.computeInvoice(10, 6, 20);//calling method computeInvoice

  }

}

Output:

please find attached file.

Explanation:

In the above-given code, a class "Invoicing" is defined, inside the class two static double variable "Total and Tax" is defined, in which the Tax variable holds a value that is "8.0".

In class three same method, "computeInvoice" is used that accepts a different parameter for providing method overloading, which can be defined as follows:

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