The synchronizedSet() method of java.util.Collections class is used to return a synchronized (thread-safe) set backed by the specified set. In order to guarantee serial access, it is critical that all access to the backing set is accomplished through the returned set.
Syntax:
public static <T> Set<T> synchronizedSet(Set<T> s)
Parameters: This method takes the set as a parameter to be “wrapped” in a synchronized set.
Return Value: This method returns a synchronized view of the specified set.
Below are the examples to illustrate the synchronizedSet() method
Example 1:
// Java program to demonstrate// synchronizedSet() method// for String Value import java.util.*; public class GFG1 { public static void main(String[] argv) throws Exception { try { // creating object of Set<String> Set<String> set = new HashSet<String>(); // populate the set set.add("1"); set.add("2"); set.add("3"); // printing the Collection System.out.println("Set : " + set); // create a synchronized set Set<String> synset = Collections.synchronizedSet(set); // printing the set System.out.println("Synchronized set is : " + synset); } catch (IllegalArgumentException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
Set : [1, 2, 3] Synchronized set is : [1, 2, 3]
Example 2:
// Java program to demonstrate// synchronizedSet() method// for Integer Value import java.util.*; public class GFG1 { public static void main(String[] argv) throws Exception { try { // creating object of Set<Integer> Set<Integer> set = new HashSet<Integer>(); // populate the set set.add(100); set.add(200); set.add(300); // printing the Collection System.out.println("Set : " + set); // create a synchronized set Set<Integer> synset = Collections.synchronizedSet(set); // printing the set System.out.println("Synchronized set is : " + synset); } catch (IllegalArgumentException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
Set : [100, 200, 300] Synchronized set is : [100, 200, 300]