How to convert an array, list, Set, and map to each other in Java.

1. Array goto list:

string[] countries = {"Array", "List", "Set", "Map"};

List List = arrays.aslist (countries);

2.Array turn : Set

String [] countries = {"Array", "List", "Set"};

set<string> set = new Hashset<string> (arrays.aslist (countries));

SYSTEM.OUT.PRINTLN (set);

3. List to array:

list<string> list = new arraylist<string> ();

List.add ("Array");

List.add ("List");

List.add ("Set");

List.add ("Map");

String [] countries = List.toarray (New String[list.size ()));

4. Map to List:

list<value> list = new arraylist<value> (Map.values ());

5. Map Turn set:

Map<integer, string> map = Createmap ();

set<string> set = new Hashset<> (Sourcemap.values ());

6. List Turn set:

String[] staffs = new String[]{"Array", "List", "Set"};

List staffsList = Arrays.asList(staffs);

Set result = new HashSet(staffsList);

How to convert an array, list, Set, and map to each other in Java.