Code Recipes Blog

In this post under Java Collections, I will show with example how to create a synchronized collection.

Below is the complete main code for your reference.

1  package core.collection;
2  
3  import java.util.ArrayList;
4  import java.util.Collection;
5  import java.util.Collections;
6  import java.util.List;
7  
8  public class SyncCollectionDemo {
9      public static void main(String[] args) {
10         List<Integer> integerList = new ArrayList<>(0);
11         integerList.add(1);
12         integerList.add(2);
13         integerList.add(3);
14         integerList.add(4);
15         integerList.add(5);
16 
17         Collection<Integer> output = Collections.synchronizedCollection(integerList);
18 
19         System.out.println(output);
20     }
21 }

In the above code, I create a list of integers and populate it with elements.

Then at line 17, I call the static “synchronizedCollection” method available on “Collections” class.

This method will take a collection as an argument returns a synchronized collection.

In this way we can create a synchronized collection.

Please note once we obtain a synchronized collection, any modification to the source collection will also affect the synchronized collection and vice versa.

“Collections” class also has “synchronizedList” and “synchronizedSet” static utility methods.