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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
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
