Implement a class Bag that stores items represented as strings. Items can be rep

Question

Implement a class Bag that stores items represented as strings. Items can be repeated.

Supply methods for adding an item, and for counting how many times an item has

been added:

public void add(String itemName)

public int count(String itemName)

Your Bag class should store the data in an ArrayList<Item>, where Item is an inner class

with two instance variables: the name of the item and the quantity.

we've been learning about interfaces recently so that would probably be appropriate to use here :)

Explanation / Answer

since your program doesn't clearly tells how to implement the interface, I've used my own very simple implementation

package com.chegg;

import java.util.ArrayList;

public class Bag implements BagInterface{

public class Item{

String itemName;

int quantity;

}

Item item;

ArrayList<Item> items = new ArrayList<Item>();

public void addItem(String itemName){

item = new Item();

item.itemName = itemName;

items.add(item);

}

public int count(String itemName){

int count=0;

for(Item item: items){

if(itemName.equalsIgnoreCase(item.itemName))

count++;

}

return count;

}

public static void main(String[] args){

BagInterface bag = new Bag();

bag.addItem("ball");

bag.addItem("ball");

bag.addItem("ball");

bag.addItem("ball");

bag.addItem("apple");

bag.addItem("apple");

bag.addItem("orange");

bag.addItem("orange");

bag.addItem("orange");

System.out.println("Count of ball::"+bag.count("ball"));

System.out.println("Count of apple::"+bag.count("apple"));

System.out.println("Count of orange::"+bag.count("orange"));

}

}

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