Java Collections synchronizedList() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections synchronizedList() Method

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

Syntax

Following is the declaration of synchronizedList() method:

Parameter

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

Returns

The synchronizedList() method returns a synchronized view of the specified List.

Exceptions

Compatibility Version

Java 1.5 and above

Example 1

  import java.util.*;  public class CollectionsSynchronizedListExample1 {  public static void main(String[] args) {         //Create ArrayList object         List list = new ArrayList();        //Add values in the list        list.add(“A”);        list.add(“B”);        list.add(“C”);        list.add(“D”);        list.add(“E”);        //Create a synchronized list        List synlist = Collections.synchronizedList(list);        System.out.println(“Synchronized list is :”+synlist);        }  }  

Test it Now

Output:

Synchronized list is :[A, B, C, D, E]

Example 2

  import java.util.*;  public class CollectionsSynchronizedListExample2 {  public static void main(String[] args) {         //Create a list with items        List list = Arrays.asList(44, 55, 99, 77, 88, 66);        //Create a synchronized List        List coll = Collections.synchronizedList(list);        System.out.println(“Synchronized list is :”+coll);        }  }  

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Output:

Synchronized view is :[44, 55, 99, 77, 88, 66]

Example 3

  import java.util.*;  import java.util.concurrent.ExecutorService;  import java.util.concurrent.Executors;  import java.util.concurrent.TimeUnit;  public class CollectionsSynchronizedListExample3 {  public static void main(String[] args) throws InterruptedException {         List integers = new ArrayList<>();              List list = Collections.synchronizedList(integers);              Collections.addAll(list, new Integer[10000]);              System.out.println(“Initial size: ” + list.size());              final ExecutorService e = Executors.newFixedThreadPool(10);              for (int i = 0; i < list.size(); i++) {                  e.execute(() -> list.remove(0));              }              e.shutdown();              e.awaitTermination(1000, TimeUnit.SECONDS);              System.out.println(list.size());//should be zero        }  }  

Test it Now

Output:

Initial size: 10000  4573

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Java Collections synchronizedList() Method with Examples

Java Collections synchronizedList() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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