Question

Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as instance variables – a part number (type String), a part description (type String), a quantity of the item being purchased (type int) and a price per item (double). Your class should have a constructor that initialize the four instance variables. Provide a set and a get method for each instance variable. In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiples the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0. Write a test application names InvoiceTest that demonstrates class Invoice’s capabilities.

Answer 1

import java.io.*;
class Invoice
{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String partnum;
    String partdes;
    int numofitems;
    double priceofitems;
    double amount;
    Invoice()
    {
        partnum="1";
        partdes="hdd";
        numofitems=0;
        priceofitems=1000;

    }
    public String getpartnum()throws IOException
    {
        System.out.println("Enter part number:");
        partnum=br.readLine();
        return partnum;
    }
     public String getpartdes()throws IOException
    {
        System.out.println("Enter part description: ");
        partdes=br.readLine();
        return partdes;
    }
    public int getnumofitems()throws IOException
    {
        System.out.println("Enter number of items:");
        numofitems=Integer.parseInt(br.readLine());
        return numofitems;
    }
     public double getpriceofitems()throws IOException
    {
        System.out.println("Enter price of items:");
        priceofitems=Double.parseDouble(br.readLine());
        return priceofitems;
    }
    public String setpartnum(String num)
    {
        partnum=num;
        return partnum;
    }
     public String setpartdes(String des)
    {
        partdes=des;
        return partdes;
    }
    public int setnumofitems(int numitem)
    {
        numofitems=numitem;
        return numofitems;
    }
     public double setpriceofitems(double price )
    {
        priceofitems=price;
        return priceofitems;
    }
    public double getInvoiceamount()
    {
        amount = priceofitems*numofitems;
        amount = (amount>0)?amount:0;
        return amount;
    }
    public void displayInfo()
        {
            System.out.printf("part number:"+partnum);
System.out.printf("\n part description:"+partdes);
System.out.printf("\n num of items:"+numofitems);
System.out.printf("\n price of items:"+priceofitems);
            System.out.printf("\n Amount:"+amount);
            System.out.println();
        }
}
public class InvoiceTest
{
    public static void main(String [] args)throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Invoice i1 = new Invoice();
        Invoice i2 = new Invoice();
        i1.getpartnum();
        i1.getpartdes();
        i1.getnumofitems();
        i1.getpriceofitems();
        i1.getInvoiceamount();
        i1.displayInfo();
        i2.setpartnum("1");
        i2.setpartdes("chip");
        i2.setnumofitems(12);
        i2.setpriceofitems(12);
        i2.getInvoiceamount();
        i2.displayInfo();
    }
}