Creating a new ArrayList in Java

Question

Assuming that I have a class named Class,

And I would like to make a new ArrayList that it\'s values will be of type Class.

My question

Answer 1

Java 8

In order to create a non-empty list of fixed size where different operations like add, remove, etc won't be supported:

List fixesSizeList= Arrays.asList(1, 2);

Non-empty mutable list:

List mutableList = new ArrayList<>(Arrays.asList(3, 4));

Java 9

With Java 9 you can use the List.of(...) static factory method:

List immutableList = List.of(1, 2);

List mutableList = new ArrayList<>(List.of(3, 4));

Java 10

With Java 10 you can use the Local Variable Type Inference:

var list1 = List.of(1, 2);

var list2 = new ArrayList<>(List.of(3, 4));

var list3 = new ArrayList();

Check out more ArrayList examples here.