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Getting Synchronized Set from Java HashSet

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  • Last Updated : 07 Jan, 2021
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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]
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