How do I return an empty vector

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Java

vector

This method finds all Alien objects in the AlienList object’s Vector whose humanoid field has the value false. It stores all matching Alien objects in a new Vector that is then returned from the method. The method must also remove all the matching Alien objects from the Vector of AlienList. If there are no matching Alien objects then an empty Vector must be returned.

The only problem with my method is that when i call the method for a second time, the same two (removed) non humanoids which were returned in the first method call, are actually in this list returned by the 2nd call. Which they should have not been because they were removed on the previous call.

Here is my class with the method i need help with at the bottom:

What I have tried:

<pre>public class AlientList
{
    // instance variables - replace the example below with your own
    private Vector<Alien> aliens;
    private Vector<Alien> nonHumanoids;

    /**
     * Constructor for objects of class AlientList
     */
    public AlientList()
    {
        aliens = new Vector<>();
        nonHumanoids = new Vector<>();
    }

    public void addAlien(Alien alien)
    {
        aliens.add(alien);
    }

    public void printHumanoids()
    {
        for(Alien alien: aliens) { 
            if(alien.getHumanoid() == true){    
                System.out.println(alien.getDetails());
            }
        }
    }

    public Vector<Alien> getNonHumanoids()
    {
        Iterator<Alien> it = aliens.iterator();
        while(it.hasNext()){
            Alien alien = it.next();
            if(alien.getHumanoid() == false){
                it.remove();
                nonHumanoids.add(alien);
            }
        }
        return nonHumanoids; 
    }
}