Answered: his is the question - Create a class…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

This is the question -

Create a class named Pizza with the following data fields:

description - of type String
price - of type double

The description stores the type of pizza (such as sausage and onion). Include a constructor that requires arguments for both fields and a method named display to display the data. For example, if the description is 'sausage and onion' and the price is '14.99', the display method should output:

sausage and onion pizza Price: $14.99

Create a subclass named DeliveryPizza that inherits from Pizza but adds the following data fields:

deliveryFee - of type double
address - of type String

The description, price, and delivery address are required as arguments to the constructor. The delivery fee is $3 if the pizza ordered costs more than $15; otherwise it is $5.

This is the code I have it won't accept -

class DeliveryPizza extends Pizza

{

private double deliveryFee;

private String address;

public DeliveryPizza(String desc, double price, double deliveryFee, String address){

super(desc, price);

this.deliveryFee = deliveryFee;

this.address = address;

}

public void displayto(){

super.displayto();

if(price>=15)

{

System.out.println("Delivery Fee: $3"+"\nAddress: "+address);

}

else

System.out.println("Delivery Fee: $5"+"\nAddress: "+address);

}

---------

public class DemoPizzas {

public static void main(String args[]) {

// Write demo program here

DeliveryPizza pizza = new DeliveryPizza("sausage and oninon", 14.99, 3, "78/383 Milenium Street, WI");

pizza.displayto();

}

--------

public class Pizza {

// Define the Pizza class here

public String description;

public double price;

public Pizza(String desc, double price) {

this.description = desc;

this.price = price;

}

public void displayto() {

System.out.printf("%s pizza Price: $%.2f\n", description, price);

}

Example of one of the wrong checks -

Unit Test Incomplete

Define display method for Pizza class

Build Status

Build Failed

Build OutputNtTest5ef062cc.java:10: error: cannot find symbol pizza.display(); ^ symbol: method display() location: variable pizza of type Pizza NtTest5ef062cc.java:23: error: cannot find symbol pizza2.display(); ^ symbol: method display() location: variable pizza2 of type Pizza 2 errors

Test Contents@Test public void unitTest() { Tester.replaceOutputStream(); Pizza pizza = new Pizza("Canadian bacon and pineapple", 20.99); pizza.display(); String output = Tester.getOutput(); String expected = "Canadian bacon and pineapple pizza Price: $20.99"; assertEquals(expected, output); } @Test public void unitTest2() { Tester.replaceOutputStream(); Pizza pizza2 = new Pizza("cheese", 10.01); pizza2.display(); String output = Tester.getOutput(); String expected = "cheese pizza Price: $10.01"; assertEquals(expected, output); } public static class Tester { private static java.io.ByteArrayOutputStream outputBytes; private static java.io.PrintStream old; public static void replaceOutputStream() { Tester.outputBytes = new java.io.ByteArrayOutputStream(); Tester.old = System.out; java.io.PrintStream ps = new java.io.PrintStream(Tester.outputBytes); System.setOut(ps); } public static String getOutput() { String output = Tester.outputBytes.toString(); output = output.trim(); System.out.flush(); System.setOut(Tester.old); return output; } }

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