Chapter 19, Problem 4FTE

Explanation of Solution

Given code:

//implement the "List" interface

List <String> nameList = new ArrayList<>(); //Line 1

//declare the "ListIterator"

ListIterator it = new ListIterator(nameList); //Line 2

//set the value

it.set("Herbert"); //Line 3

Errors in the given code:

Error #1:

The error is in “Line 2”. For obtaining the list iterator for the variable “nameList”, the user need to call its list iterator method.

Correct statement:

//declare the "ListIterator"

ListIterator <String> it = nameList.ListIterator();

Error #2:

The “set” method can only be called after a successful call to one of the method “next()” or “previous()”.

Corrected statement:

//check the condition

if (it.hasNext())

{

    //get the first element

    it.next();

    //set the value

    it...