Java tutorial
import java.util.Collections; import java.util.HashSet; import java.util.Set; public class Main { public static void main(String[] args) { // create set Set<String> set = new HashSet<String>(); // populate the set set.add("A"); set.add("B"); set.add("from"); set.add("java2s.com"); // create a synchronized set Set<String> synset = Collections.synchronizedSet(set); System.out.println("Synchronized set is :" + synset); } }