Design Vending Machine in Java

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package vending;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
  * Sample implementation of Vending Machine in Java
  * @author Javin Paul
  */
public class VendingMachineImpl implements VendingMachine {   
    private Inventory<Coin> cashInventory = new Inventory<Coin>();
    private Inventory<Item> itemInventory = new Inventory<Item>();  
    private long totalSales;
    private Item currentItem;
    private long currentBalance; 
   
    public VendingMachineImpl(){
        initialize();
    }
   
    private void initialize(){       
        //initialize machine with 5 coins of each denomination
        //and 5 cans of each Item       
        for(Coin c : Coin.values()){
            cashInventory.put(c, 5);
        }
       
        for(Item i : Item.values()){
            itemInventory.put(i, 5);
        }
       
    }
   
   @Override
    public long selectItemAndGetPrice(Item item) {
        if(itemInventory.hasItem(item)){
            currentItem = item;
            return currentItem.getPrice();
        }
        throw new SoldOutException("Sold Out, Please buy another item");
    }

    @Override
    public void insertCoin(Coin coin) {
        currentBalance = currentBalance + coin.getDenomination();
        cashInventory.add(coin);
    }

    @Override
    public Bucket<Item, List<Coin>> collectItemAndChange() {
        Item item = collectItem();
        totalSales = totalSales + currentItem.getPrice();
       
        List<Coin> change = collectChange();
       
        return new Bucket<Item, List<Coin>>(item, change);
    }
       
    private Item collectItem() throws NotSufficientChangeException,
            NotFullPaidException{
        if(isFullPaid()){
            if(hasSufficientChange()){
                itemInventory.deduct(currentItem);
                return currentItem;
            }           
            throw new NotSufficientChangeException("Not Sufficient change in 
                                                    Inventory");
           
        }
        long remainingBalance = currentItem.getPrice() - currentBalance;
        throw new NotFullPaidException("Price not full paid, remaining : ", 
                                          remainingBalance);
    }
   
    private List<Coin> collectChange() {
        long changeAmount = currentBalance - currentItem.getPrice();
        List<Coin> change = getChange(changeAmount);
        updateCashInventory(change);
        currentBalance = 0;
        currentItem = null;
        return change;
    }
   
    @Override
    public List<Coin> refund(){
        List<Coin> refund = getChange(currentBalance);
        updateCashInventory(refund);
        currentBalance = 0;
        currentItem = null;
        return refund;
    }
   
   
    private boolean isFullPaid() {
        if(currentBalance >= currentItem.getPrice()){
            return true;
        }
        return false;
    }

      
    private List<Coin> getChange(long amount) throws NotSufficientChangeException{

Popularity 3/10 Helpfulness 3/10 Language java

Source: javarevisited.blogspot.com

Tags: java

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Contributed on Dec 24 2022

Deepika Sahu

0 Answers Avg Quality 2/10

How to design the Vending Machine in Java?

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Popularity 4/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Jan 15 2023

Anjali Sharma

0 Answers Avg Quality 2/10

How do you design the Vending Machine in Java?

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package vending;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
  * Sample implementation of Vending Machine in Java
  * @author Javin Paul
  */
public class VendingMachineImpl implements VendingMachine {   
    private Inventory<Coin> cashInventory = new Inventory<Coin>();
    private Inventory<Item> itemInventory = new Inventory<Item>();  
    private long totalSales;
    private Item currentItem;
    private long currentBalance; 
   
    public VendingMachineImpl(){
        initialize();
    }
   
    private void initialize(){       
        //initialize machine with 5 coins of each denomination
        //and 5 cans of each Item       
        for(Coin c : Coin.values()){
            cashInventory.put(c, 5);
        }
       
        for(Item i : Item.values()){
            itemInventory.put(i, 5);
        }
       
    }
   
   @Override
    public long selectItemAndGetPrice(Item item) {
        if(itemInventory.hasItem(item)){
            currentItem = item;
            return currentItem.getPrice();
        }
        throw new SoldOutException("Sold Out, Please buy another item");
    }

    @Override
    public void insertCoin(Coin coin) {
        currentBalance = currentBalance + coin.getDenomination();
        cashInventory.add(coin);
    }

    @Override
    public Bucket<Item, List<Coin>> collectItemAndChange() {
        Item item = collectItem();
        totalSales = totalSales + currentItem.getPrice();
       
        List<Coin> change = collectChange();
       
        return new Bucket<Item, List<Coin>>(item, change);
    }
       
    private Item collectItem() throws NotSufficientChangeException,
            NotFullPaidException{
        if(isFullPaid()){
            if(hasSufficientChange()){
                itemInventory.deduct(currentItem);
                return currentItem;
            }           
            throw new NotSufficientChangeException("Not Sufficient change in 
                                                    Inventory");
           
        }
        long remainingBalance = currentItem.getPrice() - currentBalance;
        throw new NotFullPaidException("Price not full paid, remaining : ", 
                                          remainingBalance);
    }
   
    private List<Coin> collectChange() {
        long changeAmount = currentBalance - currentItem.getPrice();
        List<Coin> change = getChange(changeAmount);
        updateCashInventory(change);
        currentBalance = 0;
        currentItem = null;
        return change;
    }
   
    @Override
    public List<Coin> refund(){
        List<Coin> refund = getChange(currentBalance);
        updateCashInventory(refund);
        currentBalance = 0;
        currentItem = null;
        return refund;
    }
   
   
    private boolean isFullPaid() {
        if(currentBalance >= currentItem.getPrice()){
            return true;
        }
        return false;
    }

      
    private List<Coin> getChange(long amount) throws NotSufficientChangeException{

Popularity 4/10 Helpfulness 1/10 Language java

Source: javarevisited.blogspot.com

Tags: java

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Contributed on Feb 21 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Design Vending Machine in Java

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