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Thread: Need some help with java lists!

  1. #1
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    Default Need some help with java lists!

    Hi, everybody! I am new to java and really hope that someone helps me.
    Based on the following code, i need to change it to have :
    2 lists with names ,first list with 10 names and the other 3. And the output to be 3 names from the first list and 1 from the second. If someone helps me i would really appreciate. THANK YOU



    // Lists, LinkedLists and ListIterators.
    import java.util.List;
    import java.util.LinkedList;
    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 ); // print list1 elements

    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 uppercase
    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 convertToUppercaseStrings

    // 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( "\nReversed List:" );

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


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Need some help with java lists!

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.

    Please explain where you are having any problems.
    If you don't understand my answer, don't ignore it, ask a question.

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