Collections synchronizedSet() method in Java with Examples
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]