Skip to content
Related Articles
Get the best out of our app
GeeksforGeeks App
Open App

Related Articles

Getting Synchronized Set from Java HashSet

Improve Article
Save Article
Like Article
Improve Article
Save Article
Like Article

In java.util.Collections class, synchronizedSet() method is used to return a synchronized (thread-safe) set backed by the specified set. This method takes the HashSet as a parameter. To guarantee serial access, it is critical that all access to the backing set is accomplished through the returned set. The task is to get the synchronized set from a given HashSet.


Input : HashSet = [3, 4, 5]
Output: synchronizedSet = [3, 4, 5]

Input : HashSet = ['a', 'b', 'c']
Output: synchronizedSet = ['a', 'b', 'c']


public static <T> Set<T> synchronizedSet(Set<T> s)

Parameters: HashSet as a parameter to be “wrapped” in a synchronized set.

Return Value: Synchronized view of the specified set.


  1. Create a HashSet.
  2. Add some elements in the HashSet.
  3. Create a Set variable and assign it with the Collections.synchronizedSet() method.
  4. Print the new synchronized Set.

Below is the implementation of the above approach:


// Java code to get synchronized
// set from hash set
import java.util.*;
public class GFG {
    public static void main(String args[])
        // creating hash set
        Set<Integer> hash_set = new HashSet<Integer>();
        // adding the elements to hash set
        // changing hash set to synchronized
        // set and storing in set
        Set synset = Collections.synchronizedSet(hash_set);
        System.out.println("Synchronized Set: " + synset);


Synchronized Set: [1, 2, 3, 4, 5]
My Personal Notes arrow_drop_up
Last Updated : 07 Jan, 2021
Like Article
Save Article
Similar Reads
Related Tutorials