Like this. I copied Lists.newArrayList
from Guava library.
import java.util.ArrayList;
import java.util.Collections;
public class Test {
public static <E> ArrayList<E> newArrayList(E... elements) {
ArrayList<E> list = new ArrayList<>(elements.length);
Collections.addAll(list, elements);
return list;
}
public static void main(String[] args) {
ArrayList<ArrayList<ArrayList<String>>> lists = newArrayList(
newArrayList(
newArrayList("A"),
newArrayList("B")
),
newArrayList(
newArrayList("A", "B"),
newArrayList("C")
),
newArrayList(
newArrayList("B", "D"),
newArrayList("E")
)
);
System.out.println(lists);
}
}