Initializing ArrayList with some predefined values [duplicate]

Answer 1

You can also use the varargs syntax to make your code cleaner:

Use the overloaded constructor:

ArrayList list = new ArrayList(Arrays.asList("a", "b", "c"));

Subclass ArrayList in a utils module:

public class MyArrayList extends ArrayList {
    public MyArrayList(T... values) {
        super(Arrays.asList(values));
    }
}

ArrayList list = new MyArrayList("a", "b", "c");

Or have a static factory method (my preferred approach):

public class Utils {
  public static  ArrayList asArrayList(T... values) {
    return new ArrayList(Arrays.asList(values));
  }
}

ArrayList list = Utils.asArrayList("a", "b", "c");