Java Collections synchronizedSet() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections synchronizedSet() Method

The synchronizedSet() method of Java Collections class is used to get a synchronized (thread-safe) set backed by the specified set.

Syntax

Following is the declaration of synchronizedSet() method:

Parameter

Parameter	Description	Required/Optional
s	It is the set which will be wrapped in a synchronized set.	Required

Returns

The synchronizedSet() method returns a synchronized view of the specified Set.

Exceptions

Example 1

  import java.util.*;  public class CollectionsSynchronizedSetExample1 {  public static void main(String[] args) {  //Create set        Set set = new HashSet();        //Add values in the set        set.add(“Facebook”);        set.add(“Twitter”);        set.add(“Whatsapp”);        set.add(“Instagram”);        //Create a synchronized set        Set synset = Collections.synchronizedSet(set);        System.out.println(“Synchronized set is :”+synset);      }  }  

Test it Now

Output:

Synchronized set is :[Twitter, Instagram, Facebook, Whatsapp]

Example 2

  import java.util.*;  public class CollectionsSynchronizedSetExample2 {  public static void main(String[] args) {  Set set = Collections.synchronizedSet(new HashSet<>());  set.add(101);  set.add(102);  set.add(103);  set.add(104);  set.add(105);  System.out.println(“Set before Synchronized set: ” + set);  System.out.println(“Set after Synchronized set-“);  //Using iterator must be synchronized manually  synchronized (set) {      Iterator iterator = set.iterator();       while (iterator.hasNext()) {          Integer num = iterator.next();          System.out.println(num);        }      }            }  }  

Test it Now

Output:

Set before Synchronized set: [101, 102, 103, 104, 105]  Set after Synchronized set-  101  102  103  104  105

Example 3

  import java.util.*;  import java.util.concurrent.ExecutorService;  import java.util.concurrent.Executors;  import java.util.concurrent.TimeUnit;  import java.util.concurrent.atomic.AtomicInteger;  public class CollectionsSynchronizedSetExample3 {      private static AtomicInteger atomicInteger = new AtomicInteger();      public static void main(String[] args) throws InterruptedException {          Set s = new HashSet<>();          Set set = Collections.synchronizedSet(s);          System.out.println(“initial set size: ” + set.size());          final ExecutorService e = Executors.newFixedThreadPool(10);          for (int i = 0; i < 1000; i++) {              e.execute(() -> set.add(atomicInteger.incrementAndGet()));          }          e.shutdown();          e.awaitTermination(1000, TimeUnit.SECONDS);          System.out.println(set.size());//should be 1000      }  }  

Test it Now

Output:

initial set size: 0  1000

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Java Collections synchronizedSet() Method with Examples

Java Collections synchronizedSet() Method

Syntax

Parameter

Returns

Exceptions

Example 1

Example 2

Example 3

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