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Getting Synchronized Set from Java TreeSet

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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 TreeSet as a parameter. To guarantee serial access, it is critical that all access to the backing set is accomplished through the returned set. We have Java TreeSet, our task is to get a synchronized set from it. For this, use synchronizedSet method of the Collections class.


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

Return Value: 

Synchronized view of the specified set.


  1. Create a TreeSet.
  2. Add some elements in the TreeSet.
  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 program to get synchronized
// set from given tree set
import java.util.Collections;
import java.util.Set;
import java.util.TreeSet;
class GFG {
    public static void main(String[] args)
        TreeSet<Integer> treeSet = new TreeSet<Integer>();
        // Elements are added using add() method
        System.out.println("TreeSet : "+treeSet);
        // converting tree set to synchronized set
        Set set = Collections.synchronizedSet(treeSet);
        System.out.println("SynchronizedSet : "+set);


TreeSet : [38, 48, 49, 59]
SynchronizedSet : [38, 48, 49, 59]
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