10.21 LAB: Grocery shopping list (LinkedList) Given a ListItem class, complete main() using the built-in Linked List type to create a linked list called shoppingList. The program should read items from input (ending with -1), adding each item to shoppingList, and output each item in shoppingList using the printNodeData() method. Ex. If the input is: milk bread eggs waffles cereal -1 the output is: milk bread eggs waffles cereal
Starter code for ShoppingList.java
import java.util.*;
import java.util.LinkedList;
public class ShoppingList{
public static void main(String[] args)
{
Scanner scnr=new Scanner(System.in);
LinkedList<ListItem>shoppingList=new LinkedList<ListItem>();//declare LinkedList
String item;
int i=0,n=0;//declare variables
item=scnr.nextLine();//get input from user
while(item.equals("-1")!=true)//get inputuntil user not enter -1
{
shoppingList.add(new ListItem(item));//add into shoppingList LinkedList
n++;//increment n
item=scnr.nextLine();//get item from user
}
for(i=0;i<n;i++)
{
shoppingList.get(i).printNodeData();//call printNodeData()for each object
}
}
}
class ListItem{
String item;
//constructor
ListItem(String item)
{
this.item=item;
}
void printNodeData()
{
System.out.println(item);
}
}
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