Question

Project 2

Tasks:

Create a Coin.java class that includes the following:

            Takes in a coin name as part of the constructor and stores it in a private string

            Has a method that returns the coins name

            Has an abstract getvalue method

Create four children classes of Coin.java with the names Penny, Nickle, Dime, and Quarter that includes the following:

            A constructor that passes the coins name to the parent

            A private variable that defines the value of the coin

            A method that returns the coins name via the parent class

            And any other methods that should be required.

Create a Pocket class that includes the following:

            An ArrayList of type coin to manage coins.(You MUST use an ARRAYLIST)

            A method that allows a coin to be added

            A method that allows a coin to be removed

            A method that returns a count of the coins in your arraylist by coin type.

            A method that returns a total value of all the coins in your arraylist   

Create a NoSuchCoin class that will act as your custom exception (see pg.551 in book).

Create a PocketMain class that includes the following :

            Creates an object of type pocket to be used below

            A main method that prompts the user with a menu of options to include:

                        Add a coin (must specify type)

                        Remove a coin (must specify type)

                        Display a coin count

                        Display a total value in the pocket

                        An ability to exit the program

            This method must handle poor user input somehow using your custom exception

YOU MUST COMMENT YOUR CODE SO I KNOW WHAT IS HAPPNEING!!!

Answer 1

Coin.java

--------------------

package coinFamily;

//coin class

public abstract class Coin {

private String name;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Coin(String name) {

super();

this.name = name;

}

public abstract float getValue();

}

//child classes for coin

//coin values are in cents

//1 penny = 1 cent

class Penny extends Coin{

private int coinValue;

  

public Penny(String name) {

super(name);

coinValue = 1;

}

@Override

public float getValue() {

return coinValue;

}

}

class Nickle extends Coin{

private int coinValue;

  

public Nickle(String name) {

super(name);

coinValue = 5;

}

@Override

public float getValue() {

return coinValue;

}

}

class Dime extends Coin{

private int coinValue;

  

public Dime(String name) {

super(name);

coinValue = 10;

}

@Override

public float getValue() {

return coinValue;

}

}

class Quarter extends Coin{

private int coinValue;

  

public Quarter (String name) {

super(name);

coinValue = 25;

}

@Override

public float getValue() {

return coinValue;

}

}

NoSuchCoin.java

---------------------------------

package coinFamily;

//class extends exception class

public class NoSuchCoin extends Exception{

//create new exception

public NoSuchCoin(String s){

super(s);

}

  

}

PocketClass.java

--------------------------------

package coinFamily;

import java.util.ArrayList;

import java.util.Scanner;

//pocket class

public class PocketClass {

//coin arraylist

private ArrayList<Coin> coins;

//default constructor

public PocketClass() {

super();

coins = new ArrayList<>();

}

//add coin to list

void addCoin(Coin coin){

coins.add(coin);

}

//remove coin by name

void removeCoin(Coin coin){

for (Coin c : coins ){

if(c.getName().equalsIgnoreCase(coin.getName())){

coins.remove(c);

return;

}

}

}

//get count by coin name

int getCount(Coin coin){

int count=0;

for (Coin c : coins ){

if(c.getName().equalsIgnoreCase(coin.getName())){

count++;

}

}

System.out.println("Coin name : "+coin.getName()+" Count : "+count);

return count;

}

//get total coin value

int getTotalValue(){

int totalValue=0;

for (Coin c : coins ){

totalValue+=c.getValue();

}

System.out.println("Total coin value is : "+totalValue+" Cents");

return totalValue;

}

//main method

public static void main(String[] args){

//scanner for int input

Scanner sc = new Scanner(System.in);

//scanner for string input

Scanner scString = new Scanner(System.in);

//user choice

int choice;

//for name

String name;

//pocket class

PocketClass pocket = new PocketClass();

do{

System.out.println("Enter you coice ");

System.out.println("1 : Add coin");

System.out.println("2 : Remove coin");

System.out.println("3 : Display coin count");

System.out.println("4 : Display total value in the pocket");

System.out.println("Anything else to exit.");

choice = sc.nextInt();

if(choice==1){

System.out.println("Enter coin name : ");

name = scString.nextLine();

if(name.equalsIgnoreCase("penny")){

Penny p = new Penny(name);

pocket.addCoin(p);

}else if(name.equalsIgnoreCase("Nickle")){

Nickle n = new Nickle(name);

pocket.addCoin(n);

}else if(name.equalsIgnoreCase("Dime")){

Dime d = new Dime(name);

pocket.addCoin(d);

}else if(name.equalsIgnoreCase("Quarter")){

Quarter q = new Quarter(name);

pocket.addCoin(q);

}else{

try {

throw new NoSuchCoin("Not a valid coin");

} catch (NoSuchCoin e) {

e.printStackTrace();

}

}

}else if(choice==2){

System.out.println("Enter coin name : ");

name = scString.nextLine();

if(name.equalsIgnoreCase("penny")){

Penny p = new Penny(name);

pocket.removeCoin(p);

}else if(name.equalsIgnoreCase("Nickle")){

Nickle n = new Nickle(name);

pocket.removeCoin(n);

}else if(name.equalsIgnoreCase("Dime")){

Dime d = new Dime(name);

pocket.removeCoin(d);

}else if(name.equalsIgnoreCase("Quarter")){

Quarter q = new Quarter(name);

pocket.removeCoin(q);

}else{

try {

throw new NoSuchCoin("Not a valid coin");

} catch (NoSuchCoin e) {

e.printStackTrace();

}

}

}else if(choice==3){

System.out.println("Enter coin name : ");

name = scString.nextLine();

if(name.equalsIgnoreCase("penny")){

Penny p = new Penny(name);

pocket.getCount(p);

}else if(name.equalsIgnoreCase("Nickle")){

Nickle n = new Nickle(name);

pocket.getCount(n);

}else if(name.equalsIgnoreCase("Dime")){

Dime d = new Dime(name);

pocket.getCount(d);

}else if(name.equalsIgnoreCase("Quarter")){

Quarter q = new Quarter(name);

pocket.getCount(q);

}else{

try {

throw new NoSuchCoin("Not a valid coin");

} catch (NoSuchCoin e) {

e.printStackTrace();

}

}

}else if(choice==4){

pocket.getTotalValue();

}

//repeat until choice is in the range

}while(choice>=1 && choice<=4);

sc.close();

scString.close();

}

}

output:

Console 3 PocketClass [Java Application] C:\Program Files\Javare7\bin\javaw.exe (Mar 10, 2018, 3 Enter you coice 1: Add coin 2 Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit. 1 Enter coin name : quarter Enter you coice 1: Add coin 2 Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit. 1 Enter coin name : penny Enter you coice 1: Add coin 2: Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit. Total coin value is: 26 Cents Enter you coice 1: Add coin 2: Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit. Enter coin name : quarter Coin name: quarter Count:1

Total coin value is: 26 Cents Enter you coice 1: Add coin 2: Remove coin 3: Display coin count 4:Display total value inthe pocket Anything else to exit. Enter coin quarter Coin name quarter Count :1 Enter you coice 1: Add coin 2 Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit. 2 Enter coin name : quarter Enter you coice 1: Add coin 2: Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit. name Total coin value is:1 Cents Enter you coice 1: Add coin 2: Remove coin 3: Display coin count 4 : Display total value in the pocket Anything else to exit.