Initialization of an ArrayList in one line

Question

I wanted to create a list of options for testing purposes. At first, I did this:

ArrayList places = new ArrayList();
places.add(\         


        

Answer 1

You could create a factory method:

public static ArrayList createArrayList(String ... elements) {
  ArrayList list = new ArrayList();
  for (String element : elements) {
    list.add(element);
  }
  return list;
}

....

ArrayList places = createArrayList(
  "São Paulo", "Rio de Janeiro", "Brasília");

But it's not much better than your first refactoring.

For greater flexibility, it can be generic:

public static  ArrayList createArrayList(T ... elements) {
  ArrayList list = new ArrayList();
  for (T element : elements) {
    list.add(element);
  }
  return list;
}