(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.

NO ARRAYLIST, NO IMPORTS(ONLY SCANNER).KEEP EVERYTHING AS SIMPLE AS YOU CAN.

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

 Here is the code for the question. Please do not forget to rate the answer if it helped. Thank you very much.

Donut.java

public class Donut {

private String name;

private String type;

private double price;

public Donut(String name, String type)

{

setName(name);

setType(type);

if(type.equals(“Plain”))

setPrice(0.99);

else if(type.equals(“Glazed”))

setPrice(1.29);

else if(type.equals(“Filled”))

setPrice(1.49);

}

 

//public getters

public String getName() {

return name;

}

 

public String getType() {

return type;

}

 

public double getPrice() {

return price;

}

//private setters

private void setName(String name) {

if(name == null || name.equals(“”))

this.name = “Classic”;

else

this.name = name;

}

private void setType(String type) {

if(type.equals(“Plain”) || type.equals(“Filled”) || type.equals(“Glazed”))

this.type = type;

else

this.type = “Plain”;

}

 

private void setPrice(double p)

{

this.price = p;

}

 

public String toString()

{

return “Name: “+name+

” Type: “+type+

” Price: “+price;

 

}

 

public boolean equals(Donut other)

{

if(name.equals(other.name) && type.equals(other.type))

return true;

else

return false;

}

}

DonutBox.java

public class DonutBox {

private Donut donuts[];

private int count;

public enum Size{SMALL, MEDIUM, LARGE}

public DonutBox()

{

donuts = new Donut[12]; // a dozen donuts

count = 0;

}

 

public int getCount()

{

return count;

}

 

public void addDonut(Donut order)

{

if(count < 12) //check if there is space

{

donuts[count] = order;

count++;

}

}

 

public double getPrice()

{

double total = 0;

for(int i = 0; i< count; i++)

total = total + donuts[i].getPrice();

 

//apply discount

if(count == 12)

total = total – 0.20 * total;

else if(count >=6 && count <12)

total = total – 0.10 * total;

 

return total;

}

 

public String toString()

{

String str=””;

for(int i = 0; i<count; i++)

str += “n” + donuts[i].toString();

return str;

}

 

public Size getSize()

{

if(count == 1)

return Size.SMALL;

else if(count <= 6)

return Size.MEDIUM;

else

return Size.LARGE;

}

}

DonutBoxDriver.java

public class DonutBoxDriver {

public static void main(String[] args) {

DonutBox box1 = new DonutBox();

DonutBox box2 = new DonutBox();

DonutBox box3 = new DonutBox();

DonutBox box4 = new DonutBox();

 

 

box1.addDonut(new Donut(“Classic”,”Plain”));

box1.addDonut(new Donut(“Classic”,”Glazed”));

box1.addDonut(new Donut(“Classic”,”Filled”));

box1.addDonut(new Donut(“Sugar Ice”,”Plain”));

box1.addDonut(new Donut(“Coco coo”,”Glazed”));

box1.addDonut(new Donut(“Snow white”,”Plain”));

 

box2.addDonut(new Donut(“Classic”,”Plain”));

 

box3.addDonut(new Donut(“Jacky Chunk”,”Plain”));

box3.addDonut(new Donut(“Black Jack”,”Plain”));

box3.addDonut(new Donut(“Classic”,”Plain”));

box3.addDonut(new Donut(“Classic”,”Glazed”));

box3.addDonut(new Donut(“Classic”,”Filled”));

box3.addDonut(new Donut(“Sugar Ice”,”Plain”));

box3.addDonut(new Donut(“Coco coo”,”Glazed”));

box3.addDonut(new Donut(“Snow white”,”Plain”));

 

box4.addDonut(new Donut(“Jacky Chunk”,”Plain”));

box4.addDonut(new Donut(“Black Jack”,”Plain”));

box4.addDonut(new Donut(“Classic”,”Plain”));

box4.addDonut(new Donut(“Classic”,”Glazed”));

box4.addDonut(new Donut(“Classic”,”Filled”));

box4.addDonut(new Donut(“Sugar Ice”,”Plain”));

box4.addDonut(new Donut(“Coco coo”,”Glazed”));

box4.addDonut(new Donut(“Snow white”,”Plain”));

box4.addDonut(new Donut(“Jacky Chunk”,”Plain”));

box4.addDonut(new Donut(“Black Jack”,”Plain”));

box4.addDonut(new Donut(“Classic”,”Plain”));

box4.addDonut(new Donut(“Classic”,”Glazed”));

 

System.out.println(“Box 1″+box1 +” n Price: ” + box1.getPrice());

System.out.println(“Box 2″+box2 +” n Price: ” + box2.getPrice());

System.out.println(“Box 3″+box3 +” n Price: ” + box3.getPrice());

System.out.println(“Box 4″+box4 +” n Price: ” + box4.getPrice());

 

}

}

output

Box 1

Name: Classic Type: Plain Price: 0.99

Name: Classic Type: Glazed Price: 1.29

Name: Classic Type: Filled Price: 1.49

Name: Sugar Ice Type: Plain Price: 0.99

Name: Coco coo Type: Glazed Price: 1.29

Name: Snow white Type: Plain Price: 0.99

Price: 6.336

Box 2

Name: Classic Type: Plain Price: 0.99

Price: 0.99

Box 3

Name: Jacky Chunk Type: Plain Price: 0.99

Name: Black Jack Type: Plain Price: 0.99

Name: Classic Type: Plain Price: 0.99

Name: Classic Type: Glazed Price: 1.29

Name: Classic Type: Filled Price: 1.49

Name: Sugar Ice Type: Plain Price: 0.99

Name: Coco coo Type: Glazed Price: 1.29

Name: Snow white Type: Plain Price: 0.99

Price: 8.118000000000002

Box 4

Name: Jacky Chunk Type: Plain Price: 0.99

Name: Black Jack Type: Plain Price: 0.99

Name: Classic Type: Plain Price: 0.99

Name: Classic Type: Glazed Price: 1.29

Name: Classic Type: Filled Price: 1.49

Name: Sugar Ice Type: Plain Price: 0.99

Name: Coco coo Type: Glazed Price: 1.29

Name: Snow white Type: Plain Price: 0.99

Name: Jacky Chunk Type: Plain Price: 0.99

Name: Black Jack Type: Plain Price: 0.99

Name: Classic Type: Plain Price: 0.99

Name: Classic Type: Glazed Price: 1.29

Price: 10.624

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