JAVA EE: Java : Collection Framework : ArrayList (ListIterator)

Friday 10 October 2014

Java : Collection Framework : ArrayList (ListIterator)

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ArrayListExample.java

import java.util.ArrayList;
import java.util.ListIterator;

/*
 * Example of how to use ListIterator
 */
public class ArrayListExample
{

    public static void main( String[] args )
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        ListIterator<String> listIterator = arrayList.listIterator();

        /*
         * Using ListIterator move the cursor in forward direction and get each
         * element.
         */

        System.out.println("Forward Direction -----" + "\n");

        while( listIterator.hasNext() )
        {
            int nextIndex = listIterator.nextIndex();
            String name = listIterator.next();
            System.out.println(nextIndex + " : " + name);

        }

        System.out.println("\n" + "##############################" + "\n");

        /*
         * Using ListIterator move the cursor in reverse direction and get each
         * element.
         */

        System.out.println("Reverse Direction -----" + "\n");

        while( listIterator.hasPrevious() )
        {
            int previousIndex = listIterator.previousIndex();
            String name = listIterator.previous();
            System.out.println(previousIndex + " : " + name);
        }

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

Forward Direction -----

0 : Ram
1 : Dave
2 : Peter
3 : Julia
4 : Akram

##############################

Reverse Direction -----

4 : Akram
3 : Julia
2 : Peter
1 : Dave
0 : Ram