Initialization of an ArrayList in one line I want to create a list of options for testing purposes. At first, I did this: ArrayList<String> places = new ArrayList<String>(); places.add("Buenos Aires"); places.add("Córdoba"); places.add("La Plata"); Then I refactored the code as follows: ArrayList<String> places = new ArrayList<String>( Arrays.asList("Buenos Aires", "Córdoba", "La Plata")); Is there a better way to do this? Answer: Actually, probably the "best" way to initialize the ArrayList is the method you wrote, as it does not need to create a new List in any way: ArrayList<String>

When to use LinkedList over ArrayList? I've always been one to simply use: List<String> names = new ArrayList<String>(); I use the interface as the type name for portability, so that when I ask questions such as these I can rework my code. When should LinkedList be used over ArrayList and vice-versa? Answer: TL;DR ArrayList with ArrayDeque are preferable in much more use-cases than LinkedList. Not sure — just start with ArrayList. LinkedList and ArrayList are two different implementations of the List interface. LinkedListimplements it with a doubly-linked list. ArrayList implements it with a dynamically re-sizing array. As with standard linked list and array

Create ArrayList from array I have an array that is initialized like: Element[] array = {new Element(1), new Element(2), new Element(3)}; I would like to convert this array into an object of the ArrayList class. ArrayList<Element> arraylist = ???; Answer: new ArrayList<Element>(Arrays.asList(array)) http://stackoverflow.com/questions/157944/create-arraylist-from-array