(Solved Homework): Class design problem for JAVA.(2 CLASSES 1 DRIVER) Please Follow the directions. This is an intro to computer science class.

Class design problem for JAVA.(2 CLASSES 1 DRIVER)

Please Follow the directions. This is an intro to computer science class.


Class Design: Donut (Suggested Time Spent: < 15 minutes)

The Donut class is intended to be an abstract and simplified representation of a yummy edible donut.

Class Properties (MUST be private)

• Name of the donut

• Type of donut

• Price of the donut Class Invariants

• Donut name must not be empty (Default: “Classic”)

• Type of donut can only be one of the following: “Plain,” “Filled,” or “Glazed” (Default: “Plain”)

Class Components

• Public Getter and Private Setter for name, type, and price – enforce invariants

• A constructor that takes in as argument the name and type of the donut (enforce invariants)

o Determine the price of the donut based on the type:

▪ $0.99 for plain

▪ $1.29 for glazed

▪ $1.49 for filled

• A toString() method that returns the name, type, and price of the donut.

• An equals() method that returns true if it’s the same name and type (regardless of price).

Class Design: DonutBox (Suggested Time Spent: < 15 minutes)

The DonutBox class is intended to be an abstract and simplified representation of a box of donuts. Among other things, this object should be able to list the price of the donuts.

Class Properties (MUST be private)

• Donuts (Donut[]) – an array of donuts

• Count – number of donuts in the box Class Invariants

• A box can have at most a dozen donuts Class Components

• Public getter ONLY for count • public void addDonut (Donut order) {}

• public double getPrice() {}

o Returns the total price (before tax) of the donuts in the box, with applicable discount:

▪ Under 6 donuts, no discount

▪ 6 to 12 donuts, 10% discount

▪ 12 donuts exactly, 20% discount

• public String toString() {} – returns a String containing all the donuts in the box

• (Extra Credit: 1 point)

An enum for box type (Small, Medium, Large)

• (Extra Credit: 1 point)

A public method that returns the size of the box as an enum constant.

o Small box fits exactly one donut, medium fits up to six donuts, large fits up to 12.

Driver Class: DonutBoxDriver (Suggested Time Spent: < 10 minutes)

The DonutBoxDriver class is intended to be a simple driver to test the Donut and DonutBox objects and should include a main() method as well as other helper methods. At minimum, the driver class should:

• Create a box with only one donut

• Create a box of up to six donuts

• Create a box of more than six but less than twelve donuts

• Create a box of dozen donuts

• For each box created

o Print out the contents

o Print out the price (before tax) of the donuts in the box

Grading Criteria

• Donut class object (Total: 15 Points)

o [1 Point] Proper class definition syntax

o [3 Points] Implements all required properties

o [1 Points] Implements required getters

o [2 Points] All invariants properly enforced

o [3 Points] Constructor properly implemented

o [3 Points] toString method properly implemented

o [2 Points] equals method properly implemented

• DonutBox class object (Total: 15 Points) o

[1 Point] Proper class definition syntax

o [2 Points] Implements all required properties

o [1 Point] Implements required getter

o [2 Points] All invariants properly enforced

o [9 Points] Methods (addDonut, getPrice, toString) properly implemented (3 points per method)

• DonutBoxDriver program (Total: 10 Points)

o [1 Point] Proper class definition syntax

o [1 Point] Proper main method syntax

o [8 Points] Create, print contents and price of the four boxes (2 points per box created)

Expert Answer


Java program to implement Donut orders by using two class and a driver class.
The objective is to create multiple donut boxes. Each box contains a number od donuts.then print the total price
and size of each box*/
import java.util.Scanner;
//class Donut defined
class Donut
private String name;
private String type;
private double price;

//default constructor
public Donut()
//constructor to set the donut name and type and calculate price
public Donut(String name,String type)

//getter for name
public String getName()
return name;

//getter for type
public String getType()
return type;

//getter for price
public double getPrice()
return price;
//setter for name
private void setName(String name)
//setter for type
private void setType(String type)
this. type=type;

//setter for price
private void setPrice(double price)

//toString() return the name,type and price of dinuts
public String toString()
return “Name : “+name+”, Type : “+type+” , Price : “+price;
//check two donut objects are equal or not
public boolean equals(Donut other)
if(name.equalsIgnoreCase(other.name) && type.equalsIgnoreCase(other.type))
return true;
return false;

//class DonutBox
class DonutBox
private Donut donut[]=new Donut[12];
private int count;

//cpnstructor to set count
public DonutBox()

//Getter fpr count
public int getCount()
return count;
//this method add a donut into DonutBox
public void addDonut(Donut order)
donut[count]=new Donut(order.getName(),order.getType());

//Getter for price of all the donuts in the DonutBox
public double getPrice()
double totalPrice=0.00;
double discount=0.00;
for(int i=0;i<count;i++)
totalPrice=totalPrice+ donut[i].getPrice();

//discount computaion
else if(count>=6 && count<12)
else if(count==12)
double netPrice=totalPrice-discount;
return netPrice;

//toString() return the name,type and price of all the donuts in the box
public String toString()
String s=””;
for(int i=0;i<count;i++)
s+=   “nName : “+donut[i].getName()+”, Type : “+donut[i].getType()+” , Price : “+donut[i].getPrice();
return s;

//returns the size of the box
public String size()
String boxSize=””;
else if(count>=1 && count<6)
else if(count>6 && count<=12)

return boxSize;

public class DonutBoxDriver
public static void main(String arg[])
//cretae box1 , that contains 1 donut
DonutBox box1=new DonutBox();
box1.addDonut(new Donut(“Chocolate”,”Filled”));
System.out.printf(“Price of box1 :%.2fn”,box1.getPrice());
System.out.println(“Size of box1 :”+ box1.size());

//cretae box2, that contains 5 donut
DonutBox box2=new DonutBox();
box2.addDonut(new Donut(“Vanila”,”Filled”));
box2.addDonut(new Donut(“Strawbwrry”,”Glazed”));
box2.addDonut(new Donut(“Choco”,”Plain”));
box2.addDonut(new Donut(“Pineapple”,”Filled”));
box2.addDonut(new Donut(“Orange”,”Glazed”));
System.out.printf(“Price of box2 :%.2fn”, box2.getPrice());
System.out.println(“Size of box2 :”+ box2.size());

//cretae box1 , that contains 8 donut
DonutBox box3=new DonutBox();
box3.addDonut(new Donut(“Mango”,”Plain”));
box3.addDonut(new Donut(“Apple”,”Glazed”));
box3.addDonut(new Donut(“Choco”,”filled”));
box3.addDonut(new Donut(“Vanila”,”Filled”));
box3.addDonut(new Donut(“Papaya”,”Glazed”));
box3.addDonut(new Donut(“Gluco”,”Plain”));
box3.addDonut(new Donut(“Mango”,”Filled”));
box3.addDonut(new Donut(“Papaya”,”Plain”));
System.out.printf(“Price of box3 :%.2fn”, box3.getPrice());
System.out.println(“Size of box3 :”+ box3.size());


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