Online Java Compiler By
JavaTpoint.com
import java.util.*; import java.util.concurrent.ConcurrentHashMap; public class CollectionsNewSetFromMapExample3 { public static void main(String[] args) { Set
users = Collections.newSetFromMap(new ConcurrentHashMap
()); System.out.println("Users: " + users); users.add("Java"); users.add("PHP"); System.out.println("Users: " + users); } }
Output