Question

Objective: Read in the names of several grocery items from the keyboard and create a shopping list using the Java ArrayList abstract data type.

1) Create a new empty ArrayList

2) Ask the user for 5 items to add to a shopping list and add them to the ArrayList (get from user via the keyboard).

3) Prompt the user for an item to search for on the list. Output a message to the user letting them know whether the item exists in the shopping list. Use a method that is part of the ArrayList class to do the search.

4) Prompt the user for an item to delete from the shopping list and remove it. (be sure to handle the case where they don’t want to delete anything). Use a method that is part of the ArrayList class to do the delete.

5) Prompt the user for an item to insert into the list. Ask them what they want to insert and where they want to insert it (after which item). Use a method that is part of the ArrayList class to do the insertion.

6) Output the final list to the user.

Answer 1

Please find the code below:

ShoppingList.java

package classes1;

import java.util.ArrayList;
import java.util.Scanner;

public class ShoppingList {
   public static void main(String[] args) {

       //create empty list
       ArrayList<String> items = new ArrayList<>();
       String input;
       Scanner sc = new Scanner(System.in);
       Scanner scInt = new Scanner(System.in);
       //adding five items
       for(int i=0;i<5;i++){
           System.out.print("Enter name of item "+(i+1)+" : ");
           input = sc.nextLine();
           items.add(input);
       }

       //ask and search for an input
       System.out.print("Enter name of item to search : ");
       input = sc.nextLine();
       if(items.contains(input)){
           System.out.println("Item "+input+" present in the list");
       }else{
           System.out.println("Item "+input+" is not present in the list");
       }

       //ask and delete item
       System.out.print("Enter name of item to remove : ");
       input = sc.nextLine();
       if(items.contains(input)){
           items.remove(input);
           System.out.println("Item "+input+" removed from the list");
       }else{
           System.out.println("Item "+input+" is not present in the list");
       }

       //ask and delete item
       System.out.print("Enter name of item to insert : ");
       input = sc.nextLine();
       System.out.print("Enter location where need to add : ");
       int index = scInt.nextInt();
       try{
       items.add(index, input);
       }catch(Exception e){
           System.out.println("Error, Index is out of bound");
       }

      
       //printing items
       System.out.println("\nItems in the cart is as below");
       for(String s : items){
           System.out.println(s);
       }
   }
}

output: