Java ArrayList Initialization: 4 Methods

In Java, there are several ways to initialize an ArrayList.

1. Using the constructor of the ArrayList class:

ArrayList<String> list = new ArrayList<>();

1. By utilizing the Arrays.asList() method:

ArrayList<String> list = new ArrayList<>(Arrays.asList("item1", "item2", "item3"));

1. Utilize the Collections.addAll() method:

ArrayList<String> list = new ArrayList<>();
Collections.addAll(list, "item1", "item2", "item3");

1. Utilize the List.of() method in Java 9:

ArrayList<String> list = new ArrayList<>(List.of("item1", "item2", "item3"));