Question

1 // Application contains a starting list of three products for sale2 // The user is prompted for additional items3 // After each new entry, the alphabetically sorted list is displayed4 import java.util.*;5 public class DebugNine36 {7 public static void main(String[] args)8 {9 ArrayListproducts = new ArrayList();10 products.add(shampoo);11 products.add(moisturizer);12 products.add(conditioner);13 Collections.sort(products);14 display(products);15 final String QUIT = "quit";16 String entry;17 Scanner input = new Scanner(System.in);18 System.out.print("\nEnter a product or " + QUIT + " to quit >> ");19 entry = input.nextLine();20 while(entry.equals("quit"))21 {22 products.add(entry);23 Collections.sort(products);24 display()25 System.out.print("\nEnter a product or " + QUIT + " to quit >> ");26 entry = input.nextLine();27 }28 public static void display(ArrayList products)29 {30 System.out.println("\nThe size of the list is " + products.size());31 for(int x = 0; x == products.size(); ++x)32 System.out.println(products.get(x));33 }34 }35//Debugging Exercises, Chapter 9;Java Programming, Joyce Farraell, 8th

Answer 1

Answer:

Here is the corrected code:

import java.util.*;

public class DebugNine36 {  //class name

  public static void main(String[] args)    {  //start of main method

     ArrayList<String>products = new ArrayList<String>();  //creates an ArrayList of type String names products

     products.add("shampoo");  //add shampoo to product array list

     products.add("moisturizer");  //add moisturizer product array list

     products.add("conditioner");  //add conditioner product array list

     Collections.sort(products);  //sort the elements in products array list

     display(products);  //calls display method by passing products array list

     final String QUIT = "quit";  //declares a variable to quit the program

     String entry;  //declares a variable to hold product/element or quit

     Scanner input = new Scanner(System.in);  //creates Scanner object

     System.out.print("\nEnter a product or " + QUIT + " to quit >> ");  //prompts user to enter a product or enter quit to exit

     entry = input.nextLine();  //reads the entry value from user

     while(!entry.equals("quit"))       {  //loops until user enters quit

        products.add(entry);  //adds entry (product) to products array list

        Collections.sort(products);  //sorts the elements in products array list

        display(products);  //calls display method by passing products arraylist

        System.out.print("\nEnter a product or " + QUIT + " to quit >> ");  //keeps prompting user to enter a product or enter quit to exit

        entry = input.nextLine();        }    }  //reads the entry value from user

  public static void display(ArrayList products)    {  // method to display the list of products

     System.out.println("\nThe size of the list is " + products.size());  //displays the size of the array list named products

     for(int x = 0; x < products.size(); ++x)  //iterates through the arraylist products

        System.out.println(products.get(x));    }  } //displays each item/element in products array list

Explanation:

In the code the following statement are corrected:

1.

ArrayListproducts = new ArrayList();

This gave an error: cannot find symbol

This is corrected to :

 ArrayList<String>products = new ArrayList<String>();

2.

         products.add(shampoo);

         products.add(moisturizer);

         products.add(conditioner);

Here shampoo moisturizer and conditioner are String type items that are to be added to the products so these strings have to be enclosed in quotation marks.

This is corrected to :

     products.add("shampoo");

     products.add("moisturizer");

     products.add("conditioner");

3.

display();

This method is called without giving any arguments to this method. The method display takes an ArrayList as argument so it should be passed the arraylist products to avoid error that actual and formal argument lists differ in length .

This is corrected to :

display(products);

The screenshot of output is attached.