ListTest

[kayln]

rewrite lines 16-25(bold and underlined) to be more concise by using the asList method and the LinkedList constructor that takes a Collection argument.

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

public class ListTest {

public static void main(String[] args)
{
//add colors elements to list1

String[] colors =
{"black", "yellow", "green", "blue", "violet", "silver"};
List<String>list1 = new LinkedList<String>();

for(String color: colors)
list1.add(color);

//add colors2 elements to list2
String[] colors2 =
{"gold", "white", "brown", "blue", "gray", "silver"};
List<String>list2 = new LinkedList<String>();

for (String color: colors2)
list2.add(color);
list1.addAll(list2);//concatenate lists
list2 = null; //release resources
printList(list1); //print list1 elements

convertToUppercaseStrings(list1);//convert to uppercase string
printList(list1);

System.out.print("\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
}//end main

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

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

System.out.println();
}//end method printList

//Locate String objects and convert to upper case
private static void convertToUppercaseStrings(List<String>list)
{
ListIterator<String>iterator = list.listIterator();

while(iterator.hasNext())
{
String color = iterator.next();//get item
iterator.set(color.toUpperCase());//convert to upper case
}//end while
}//end method covertToUppercaseString

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

//print reversed list
private static void printReversedList(List<String>list)
{
ListIterator<String>iterator = list.listIterator(list.size());

System.out.println("\nReversedList");

//print list in reversed order
while(iterator.hasPrevious())
System.out.printf("%s", iterator.previous());
}//end method printReversed list
}//end class ListTest


Thank You all for help

[Fubarable]

Thanks for posting your assignment. Do you have an actual question that's not, "here's my code and assignment, please fix it for me"?

[kayln]

for(String color: colors)
list1.add(color);

//add colors2 elements to list2
String[] colors2 =
{"gold", "white", "brown", "blue", "gray", "silver"};
List<String>list2 = new LinkedList<String>(Array.asList(colors2));

for (String color: colors2)
list2.add(color);
if i put asList there, i get error. what other change should i make?

[Fubarable]

for(String color: colors)
list1.add(color);

//add colors2 elements to list2
String[] colors2 =
{"gold", "white", "brown", "blue", "gray", "silver"};
List<String>list2 = new LinkedList<String>(Array.asList(colors2));

for (String color: colors2)
list2.add(color);
if i put asList there, i get error. what other change should i make?

You would need to call this method on the java.util.Arrays class not the Array class. You will either need to import this class and call it similar to how you're doing it:

List<String>list2 = new LinkedList<String>(Array[color="red"][b]s[/b][/color].asList(colors2));

or call it with its fully qualified name:

List<String>list2 = new LinkedList<String>(java.util.Array[color="red"][b]s[/b][/color].asList(colors2));