Java .add()

The .add() method adds an item to the underlying collection of a ListIterator object. This method adds the item before the next element that would be returned by the .next() method.

Syntax

myListIterator.add(value);

Where myListIterator is a ListIterator object, and value is the object to add to the underlying collection.

Example

This example populates an ArrayList, then inserts values between the existing values in the collection:

import java.util.*;

public class Example {
  public static void main(String args[]) {
    // Create a new ArrayList
    ArrayList l = new ArrayList();

    // Add some items to the ArrayList
    l.add(1);
    l.add(2);
    l.add(3);
    l.add(4);
    l.add(5);

    ListIterator i = l.listIterator();

    // Loop through ArrayList contents
    while(i.hasNext()) {
      int item = (Integer) i.next();
      i.add(item * 2);
    }

    System.out.println(l);
  }
}

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This results in the following output:

[1, 2, 2, 4, 3, 6, 4, 8, 5, 10]

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