Intro to JAVA Simple Programing 1. Please write the code according to the instru

Question

Intro to JAVA Simple Programing 1.

Please write the code according to the instruction, such as line of code required etc, in bold.

/**

This question practices the use of a list iterator. You have to write

a static toString(list, index) method that makes a string representation

of a list and its iterator, where you are given the index of the next

element that the iterator would return on a call to next().  

The expected output is

|

A|

AB|

ABC|

|ABC

|BC

B

C

BC|

*/

import java.util.LinkedList ;

import java.util.ListIterator ;

import java.util.Scanner ;

public class LinkedListTester4

{

public static void main(String[] args)

{

LinkedList<String> list = new LinkedList<String>() ;

ListIterator<String> iterator = list.listIterator() ;

System.out.println(toString(list, iterator.nextIndex())) ;

iterator.add("A") ;

System.out.println(toString(list, iterator.nextIndex())) ;

iterator.add("B") ;

System.out.println(toString(list, iterator.nextIndex())) ;

iterator.add("C") ;

System.out.println(toString(list, iterator.nextIndex())) ;

iterator = list.listIterator() ;

System.out.println(toString(list, iterator.nextIndex())) ;

if (iterator.next().equals("A"))

iterator.remove() ;

System.out.println(toString(list, iterator.nextIndex())) ;

while (iterator.hasNext())

System.out.println(iterator.next()) ;

System.out.println(toString(list, iterator.nextIndex())) ;

}

/**

A static method to return a string representation of the

list and the iterator. Note that the listIterator method

nextIndex gives the index of the next element that would be

returned by a call to next, or list size if the list iterator

is at the end of the list. The four possible pictures for a

list [A,B,C] are:

|ABC here index would be 0

A|BC here index would be 1

AB|C here index would be 2

ABC| here index would be 3 (i.e., the size of the list)

@param list the linked list of type LinkedList<String>

@param index of next element that the iterator would return by next

@return a string representation like A|BC

*/

//-----------Start below here. To do: approximate lines of code = 11

// 1. signature of method ;

  

  

//2. initialize result to empty string ;

  

//3. if index is 0 ;

  

//then put "|" on result ;

  

//4. initialize count ;

  

//5. for each element in the list ;

  

//6. append element to result ;

  

//7. increment count ;

  

//8. if count is index ;

  

//then append "|" ;

  

  

//9. return result.

  

  

//-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.

}

Explanation / Answer

/** * Created by aman on 3/21/18. */ import java.util.LinkedList; import java.util.ListIterator; import java.util.Scanner; public class LinkedListTester4 { public static void main(String[] args) { LinkedList list = new LinkedList(); ListIterator iterator = list.listIterator(); System.out.println(toString(list, iterator.nextIndex())); iterator.add("A"); System.out.println(toString(list, iterator.nextIndex())); iterator.add("B"); System.out.println(toString(list, iterator.nextIndex())); iterator.add("C"); System.out.println(toString(list, iterator.nextIndex())); iterator = list.listIterator(); System.out.println(toString(list, iterator.nextIndex())); if (iterator.next().equals("A")) iterator.remove(); System.out.println(toString(list, iterator.nextIndex())); while (iterator.hasNext()) System.out.println(iterator.next()); System.out.println(toString(list, iterator.nextIndex())); } /** * A static method to return a string representation of the *

* list and the iterator. Note that the listIterator method *

* nextIndex gives the index of the next element that would be *

* returned by a call to next, or list size if the list iterator *

* is at the end of the list. The four possible pictures for a *

* list [A,B,C] are: *

* |ABC here index would be 0 *

* A|BC here index would be 1 *

* AB|C here index would be 2 *

* ABC| here index would be 3 (i.e., the size of the list) * * @param list the linked list of type LinkedList * @param index of next element that the iterator would return by next * @return a string representation like A|BC */ //-----------Start below here. To do: approximate lines of code = 11 private static String toString(LinkedList list, int index) { String result = ""; if (index == 0) { result = "|"; } int count = 0; for (String s : list) { count++; result = result + s; if (count == index) { result = result + "|"; } } return result; } // 1. signature of method ; //2. initialize result to empty string ; //3. if index is 0 ; //then put "|" on result ; //4. initialize count ; //5. for each element in the list ; //6. append element to result ; //7. increment count ; //8. if count is index ; //then append "|" ; //9. return result. //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions. }

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