Java, Data Structures, Arraylist, Set, Hashmap.
type as the set and use the toArray() method to fill the array with the elements of the set. Here's an example: Set<String> set = new HashSet<>(); set.add("foo"); set.add("bar"); set.add("baz"); String[] array = set.toArray(new String[0]); 9. Converting an Array to a Set To convert an array to a