Java Collections synchronizedCollection() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections synchronizedCollection() Method

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

Syntax

Following is the declaration of synchronizedCollection() method:

Parameter

Parameter	Description	Required/Optional
c	It is the collection to be “wrapped” in a synchronized collection.	Required

Returns

The synchronizedCollection() method returns a synchronized view of the specified collection.

Exceptions

Compatibility Version

Java 1.5 and above

Example 1

  import java.util.*;  public class CollectionsSynchronizedCollectionExample1 {  public static void main(String[] args) {         //Create vector object         Vector vector = new Vector();        //Add values in the vector        vector.add(“A”);        vector.add(“B”);        vector.add(“C”);        vector.add(“D”);        vector.add(“E”);        //Create a synchronized view        Collection coll = Collections.synchronizedCollection(vector);        System.out.println(“Synchronized view is :”+coll);        }  }  

Test it Now

Output:

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

Example 2

  import java.util.*;  public class CollectionsSynchronizedCollectionExample2 {  public static void main(String[] args) {         //Create a list with items        List list = Arrays.asList(44, 55, 99, 77, 88, 66);        //Create a synchronized view        Collection coll = Collections.synchronizedCollection(list);        System.out.println(“Synchronized view is :”+coll);        }  }  

Test it Now

Output:

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

Example 3

  import java.util.*;  public class CollectionsSynchronizedCollectionExample3 {  public static void main(String[] args) {         Collection obj = new ArrayList<>();    obj.add(“TutorAspire”); // not thread safe    Collection synObj = Collections.synchronizedCollection(obj);    synObj.add(“SSSIT”); // thread safe    //Below iteration will result in non-deterministic behavior    Iterator ite1 = synObj.iterator();    while (ite1.hasNext()) {    String s = ite1.next();    System.out.println(s);    }    //Below code is the right way to iterate synchronized collection    synchronized(synObj) {     Iterator ite2 = synObj.iterator();    while (ite2.hasNext()) {    String s = ite2.next();    System.out.println(s);    }    }   }  }  

Test it Now

Output:

TutorAspire  SSSIT TutorAspire SSSIT

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Java Collections synchronizedCollection() Method with Examples

Java Collections synchronizedCollection() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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