ASSESSMENT EXERCISES - FIRST BATCH

ASSESSMENT EXERCISES - FIRST BATCH

First question carries 5 marks and second question carries 10 marks . Create a class called Invoice that a hardware store might use t... 1:29:00 PM

First question carries 5 marks and second question carries 10 marks.

1. 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). 
1. Your class should have a constructor that initializes the four instance variables. Provide a set and a get method for each instance variable. 
2. In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. 
3. 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. 
4. Write a test application named InvoiceTest that demonstrates class Invoice’s capabilities.
2. Write a Java applet program that works as a simple calculator. Use a grid layout to arrange buttons for the digits and for the + – * % operations. Add a text field to display the result. The output should look as the following screenshot. 

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="Cal" width=300 height=300></applet>*/