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CS 171 - Assignment 3 (inheritance, constructor and toString())

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• Files used in the assignment

  This project requires the use of the following Java program files:

  "MenuItem.java" - Java program class that represents a menu item object "Sandwich.java" - Java program class that represent a Sandwich menu item object "Salad.java" - Java program class that represent a Salad menu item object "Drink.java" - Java program class that represent a Drink menu item object "Trio.java" - Java program class that represent a order of 3 menu items object "TestA.java" - test program for Part A of assignment "TestB.java" - test program for Part B of assignment

  Download them to your PC before doing this project.

  Abide to the Emory Honor code when doing assignments.

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• Part Aof the assignment description:

  The menu at a lunch counter includes a variety of sandwiches, salads, and drinks. Each menu item has a name and a price.

  A menu item is represented by a MenuItem object defined in the MenuItem.java class file as follows:

  /* ------------------------------------------------------------ MenuItem: this is the super class used to construct the Sandwich, Salad and Drink classes in this homework assignment ***** Do NOT make changes to this program file !!! ***** ----------------------------------------------------------- */ public class MenuItem { private String name; // Name of the menu item private double price; // Price of the menu item // Constructor public MenuItem(String n, double p) { name = n; price = p; } // getName(): returns the name of this menu item public String getName() { return name; } // getPrice(): returns the price of this menu item public double getPrice() { return price; } }

  You are to use the MenuItem class to implement 3 types menu items (i.e.: these are subclasses of MenuItem)

  The three types of menu items are represented by the following 3 classes:

  Sandwich which has a name, price and size (which can be "small", "medium" or "large") Salad which has a name, price and weight (which is expressed in number of pounds (lb)) Drink which has a name, price and volume (which is expressed in number of fluid ounces (oz))

  Part A of the assignment requires you to implement:

  The Sandwich class where you must implement a constructor method and the toString() method: You must provide a constructor that can handle the following new operation: new Sandwich(name, price, size); Examples: new Sandwich("Cheeseburger", 2.00, "small"); new Sandwich("Cheeseburger", 4.00, "large"); new Sandwich("Club Sandwich", 2.75, "small"); The toString() method that returns the name followed by the size in parethesis (without any spaces) E.g.: Cheeseburger(small) Cheeseburger(large) Club Sandwich(small) The Salad class where you must implement a constructor method and the toString() method: You must provide a constructor that can handle the following new operation: new Salad(name, price, weight); Examples: new Salad("Coleslaw", 1.50, 0.25); new Salad("Caesar Salad", 1.15, 0.1); new Salad("Caesar Salad", 1.85, 0.25); The toString() method that returns the name followed by the weight in parethesis (without any spaces) E.g.: Coleslaw(0.25lb) Caesar Salad(0.1lb) Caesar Salad(0.25lb) The Drink class where you must implement a constructor method and the toString() method: You must provide a constructor that can handle the following new operation: new Drink(name, price, volume); Examples: new Drink("Coke", 1.45, 1); new Drink("Coke", 1.75, 2); new Drink("Sprite", 1.00, 1); The toString() method that returns the name followed by the volume in parethesis (without any spaces) E.g.: Coke(1.0oz) Coke(2.0oz) Sprite(1.0oz)

  Use the Java program PartA.java to test your Sandwich, Salad and Drink classes.

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• Part B of the assignment description:

  A customer can create a "trio," which consists of three menu items: a sandwich, a salad, and a drink. The Trio class contained in Trio.java represents a "trio". The Trio class in this file is as follows:

  public class Trio { private Sandwich sandwich; private Salad salad; private Drink drink; // Part B: write the getPrice() method for the Trio class public double getPrice() { // Price of a trio (combo meal) is the sum of the 2 highest priced // items in the trio // // Compute the price of a trio and return it } // Constructor public Trio(Sandwich s1, Salad s2, Drink d) { sandwich = s1; salad = s2; drink = d; } }

  The price of the "trio" is the sum of the two highest-priced menu items in the "trio"; one item with the lowest price is free.

  For Part B of the assignment, write the getPrice() method in the Trio class

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• Turn in instructions

  Use your web browser and visit the cs171 turnin website: click here

  Turn in Sandwich.java using assignment code hw3-a Turn in Salad.java using assignment code hw3-b Turn in Drink.java using assignment code hw3-c Turn in Trio.java using assignment code hw3-d

  Follow the instructions given in homework 1 to turn in.

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• Request extension

  You must be on Emory campus (e.g.: Emory unplugged) in order to turn in an assignment

  Use your web browser and visit the cs171 turnin website: click here

  Use assignment code hw3 to request extension for this homework.

  Follow the instructions given in homework 1 to request extension.

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