Show the output of the following program:

import ch06.lists.*;

public class ListExer2

{

public static void main (String[ ] args )

{

ListInterface list1

= new RefUnsortedList ( ) ;

list1.add ( " apple " ) ; list1.add ( " peach" ) ; list1.add ( " orange " ) ; list1.add ( " pear " ) ; list1.remove ( " peach" ) ;

ListInterface list2 = new RefSortedList ( ) ;

list2.add ( " apple " ) ; list2.add ( " peach" ) ; list2.add ( " orange " ) ; list2.add ( " pear " ) ; list2.remove ( " peach " ) ;

IndexedListInterface list3

= new ArrayIndexList();

list3.add(0, apple); list3.add(0, peach); list3.add(1, orange); list3.add(0, pear); list3.add(2, plum); list3.remove(peach);

System.out.print(Unsorted);

System.out.println(list1);

System.out.print(Sorted);

System.out.println(list2);

System.out.print(Indexed);

System.out.println(list3);