import java.util.Arrays; import java.util.LinkedList; import java.util.List; imp

Question

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

public class ListTest
{
public static void main(String[] args)
{
String[] costumes =
{"Dracula", "Spiderman", "Werewolf", "Wonderwoman", "Nurse", "R2D2", "Pilot"};
  
// #1 Create a list1 using the asList method
List<String> list1 = Arrays.asList("Dracula", "Spiderman", "Werewolf", "Wonderwoman", "Nurse", "R2D2", "Pilot");

String[] scaryCostumes =
{"Dracula", "Zombie", "Werewolf", "Axe Murderer", "Blob"};
// #2 Create a list using the asList method

// #3 concatenate lists into list1 using addAll
// #4 release resources of list2

printList(list1); // print list1 elements

printList(list1); // print list1 elements
  
System.out.printf("%nDeleting elements 4 to 6...");
removeItems(list1, 4, 7); // remove items 4-6 from list
printList(list1); // print list1 elements
printReversedList(list1); // print list in reverse order
}

// output List contents
private static void printList(List<String> list)
{
System.out.printf("%nlist:%n");

for (String costume : list)
System.out.printf("%s ", costume);

System.out.println();
}

// obtain sublist and use clear method to delete sublist items
private static void removeItems(List<String> list,
int start, int end)
{
//#5 use sublist and clear to remove items
} // end method removeItems

// print reversed list
private static void printReversedList(List<String> list)
{
ListIterator<String> iterator = list.listIterator(list.size());
System.out.printf("%nReversed List:%n");
//#6 print list in reverse order

}
} // end class ListTest

Explanation / Answer

ListTest.java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.ListIterator;
public class ListTest
{
public static void main(String[] args)
{
String[] costumes =
{"Dracula", "Spiderman", "Werewolf", "Wonderwoman", "Nurse", "R2D2", "Pilot"};
  
// #1 Create a list1 using the asList method
List<String> list1 = new ArrayList(Arrays.asList("Dracula", "Spiderman", "Werewolf", "Wonderwoman", "Nurse", "R2D2", "Pilot"));
String[] scaryCostumes =
{"Dracula", "Zombie", "Werewolf", "Axe Murderer", "Blob"};
// #2 Create a list using the asList method
List<String> list2 = new ArrayList(Arrays.asList(scaryCostumes));
// #3 concatenate lists into list1 using addAll
list1.addAll(list2);
// #4 release resources of list2
list2.clear();
printList(list1); // print list1 elements

printList(list1); // print list1 elements
  
System.out.printf("%nDeleting elements 4 to 6...");
removeItems(list1, 4, 7); // remove items 4-6 from list
printList(list1); // print list1 elements
printReversedList(list1); // print list in reverse order
}
// output List contents
private static void printList(List<String> list)
{
System.out.printf("%nlist:%n");
for (String costume : list)
System.out.printf("%s ", costume);
System.out.println();
}

// obtain sublist and use clear method to delete sublist items
private static void removeItems(List<String> list,
int start, int end)
{
//#5 use sublist and clear to remove items
   list.subList(start, end);
} // end method removeItems
// print reversed list
private static void printReversedList(List<String> list)
{
ListIterator<String> iterator = list.listIterator(list.size());
System.out.printf("%nReversed List:%n");
//#6 print list in reverse order
while(iterator.hasPrevious()){
   System.out.println(iterator.previous());
}
}
} // end class ListTest}

Output:

list:
Dracula Spiderman Werewolf Wonderwoman Nurse R2D2 Pilot Dracula Zombie Werewolf Axe Murderer Blob

list:
Dracula Spiderman Werewolf Wonderwoman Nurse R2D2 Pilot Dracula Zombie Werewolf Axe Murderer Blob

Deleting elements 4 to 6...
list:
Dracula Spiderman Werewolf Wonderwoman Nurse R2D2 Pilot Dracula Zombie Werewolf Axe Murderer Blob

Reversed List:
Blob
Axe Murderer
Werewolf
Zombie
Dracula
Pilot
R2D2
Nurse
Wonderwoman
Werewolf
Spiderman
Dracula

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