Chapter 7.3, Problem 15STQ

Explanation of Solution

Modified last loop in Listing 7.8:

The last loop in Listing 7.8 is modified by using “for” loop with method “getNumberOfEntries” which is given below:

/* Compute the number of entries in the list using method "getNumberOfEntries" */

int count = toDoList.getNumberOfEntries();

/* Finally display the number of items in list using "for" loop */

for(int position = toDoList.START_POSITION; position <= count; position++)

    //Display the list of items

    System.out.println(toDoList.getEntryAt(position));

Explanation:

The modified loop is used to display the each item in the list using method “getNumberOfEntries”.

• • First compute the number of entries in the list using method “getNumberOfEntries” and store it to an integer variable “count”.
• • Then display the item one by one in the list by using “for” loop.

Complete code after changing the given loop:

The complete executable code for given program after changing the last loop in Listing 7.8 is given below:

File name: “OneWayNoRepeatsList.java”

public class OneWayNoRepeatsList

{

//Refer the textbook Listing 7.9 of chapter 7.

}

File name: “ListDemo.java” (Listing 7.8)

//Import required package

import java.util.Scanner;

//Define "ListDemo" class

public class ListDemo

{

    //Initializes required variable

    public static final int MAX_SIZE = 3; //Assumed > 0

    //Define main function

    public static void main(String[] args)

    {

//Create object "toDoList" from "OneWayNoRepeatsList" class

OneWayNoRepeatsList toDoList = new OneWayNoRepeatsList(MAX_SIZE);

        //Prompt statement for user

System.out.println("Enter items for the list, when prompted.");

        //Initializes Boolean variable

        boolean moreEntries = true;

        //Assign string variable

        String next = null;

        //Create object for scanner class

        Scanner keyboard = new Scanner(System.in);

        //Read an item from user

        while (moreEntries && !toDoList...