I\'m having trouble with wrting this program the objective is to I. Your “GoldDi

Question

I'm having trouble with wrting this program the objective is to

I. Your “GoldDigger” Class

Create a class with these instance variables:

The name of the coin

The current price of gold, per ounce

The selling price of the coin

The shipping and handling charges, per coin

The sales tax rate

The amount of gold in the coin, in milligrams

Your class will have a constructor to initialize the instance variables, accessor (i.e. “get”) methods to return the values of the instance variables, and a mutator (i.e. “set”) method that updates the price of an ounce of gold.

Your class will have 2 additional methods:

A method that computes and returns the number of coins one would have to purchase in order to own one full ounce of gold

A method that computes and returns the premium (the extra amount you would pay) when buying one ounce’s worth of coins (total cost of the number of coins computed by the above method, including S & H and sales tax) versus buying an ounce of gold.

Sales tax must be paid on the entire order for the coins, including the S & H, but not when buying the gold outright.

II. The Test Class

Now create a test class (aka: “client code”) that uses the class you created above. In the main method you will

create an object

call the accessor methods to get the data and print it

get and print the number of coins (method 1., above)

get and print the premium (method 2., above)

modify the price of an ounce of gold

get and print the updated price of gold

get and print the new premium

III. Additional Specifications

All numeric instance variables must be type double

All output is to be done in the test class. None of the GoldDigger class methods does any output

The test class must call the accessor methods to get the data stored in the instance variables, and must call separate methods to compute and return the number of coins and the premium

Make sure all output is neatly presented and clearly labeled

Do not be concerned with the number of decimal places printed – we will soon learn how to control that. Although your program must work for any valid data, use this data in the run you hand in:

Name of the coin:  $50 Gold Buffalo

Price of gold, per ounce: 1242.30

Selling price of the coin: 9.95

Shipping and handling charges: 4.95

Sales tax rate: 7.5%

Amount of gold in the coin, in mg: 14.0

Updated price of gold: 1655.50

Explanation / Answer

// GoldDigger.java

public class GoldDigger{
   String name;
   double priceGold;
   double priceCoin;
   double charges;
   double tax;
   double amount;
   GoldDigger(String n, double pc, double pg, double c, double t, double a){
       name = n;
       priceCoin = pc;
       priceGold = pg;
       charges = c;
       tax = t;
       amount = a;
   }
   String getName(){
       return name;
   }
   double getPriceCoin(){
       return priceCoin;
   }
   double getPriceGold(){
       return priceGold;
   }
   double getCharges(){
       return charges;
   }
   double getTax(){
       return tax;
   }
   double getAmount(){
       return amount;
   }
   void setPriceGold(double pg){
       priceGold = pg;
   }
   double numberOfCoins(){
       return 28349.5 / amount;
   }
   double premium(){
       return (priceCoin + charges) * tax * numberOfCoins() / 100.0 - priceGold;
   }
}

// Goldtest.java

public class Goldtest{
   public static void main(String args[]){
       GoldDigger coin = new GoldDigger("$50 Gold Buffalo", 9.95, 1242.30, 4.95, 7.5, 14.0);
       System.out.println("Number of coins needed: " + coin.numberOfCoins());
       System.out.println("Total premium paid: " + coin.premium());
   }
}

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