Question

By a question that I made, I figured out that tho copy elements from one list to an array I just need to use the method toArray() for this.

But let’s suppose I have a List with n objects. I want to copy then into a array sized n+1 and add into the first position another object and in the other n positions the n data of the list.

This is the way I’m doing it for now, but I’m just wondering if there is a better way for do that:

    Object array[] = new Object[list.size() + 1];

    Object chk = new Object();

    array[0] = chk;

    for(int i = 1; i < array.length; i++){
        array[i] = list.get(i);
    }

Answer 1

I didn’t understood what you are trying to achieve with that, but if I understood the problem correctly, this is how I would do it:

    List<Object> elementList = new ArrayList<Object>();
    Object additionalElement = new Object();
    Object array[] = null;

    //[Add code to populate the List]

    //Add the additional element
    elementList.add(0,additionalElement);

    array = elementList.toArray();

This would do the trick with the advantage of not iterating anything.