how to convert from arraylist to array in ajav code example

Example 1: java arraylist to array

List<String> list = new ArrayList<>();
list.add("a");
list.add("ab");
list.add("abc");
list.add("abcd");
// convert
String[] array = list.toArray();

Example 2: java array to arraylist

List<Element> list = Arrays.asList(array);