Collections synchronizedCollection() method in Java with Examples - GeeksforGeeks

08 Jul, 2021
The synchronizedCollection() method of java.util.Collections class is used to return a synchronized (thread-safe) collection backed by the specified collection. In order to guarantee serial access, it is critical that all access to the backing collection is accomplished through the returned collection.Syntax:  
public static <T> Collection<T>
  synchronizedCollection(Collection<T> c)
Parameters: This method takes the collection c as a parameter to be “wrapped” in a synchronized collection.Return Value: This method returns a synchronized view of the specified collection.Below are the examples to illustrate the synchronizedCollection() methodExample 1:  
Java
// Java program to demonstrate synchronizedCollection()// method for String Value import java.util.*; public class GFG1 {    public static void main(String[] argv)        throws Exception    {         try {             // creating object of List<String>            List<String> vector = new ArrayList<String>();             // populate the vector            vector.add("A");            vector.add("B");            vector.add("C");            vector.add("D");            vector.add("E");             // printing the Collection            System.out.println("Collection : " + vector);             // getting the synchronized view of Collection            Collection<String> c = Collections                                       .synchronizedCollection(vector);             // printing the Collection            System.out.println("Synchronized view"                               + " of collection : " + c);        }         catch (IndexOutOfBoundsException e) {            System.out.println("Exception thrown : " + e);        }    }}
Collection : [A, B, C, D, E]
Synchronized view of collection : [A, B, C, D, E]

Example 2:  
Java
// Java program to demonstrate synchronizedCollection()// method for Integer Value import java.util.*; public class GFG1 {    public static void main(String[] argv)        throws Exception    {         try {             // creating object of List<String>            List<Integer> vector = new ArrayList<Integer>();             // populate the vector            vector.add(20);            vector.add(30);            vector.add(40);            vector.add(50);            vector.add(60);             // printing the Collection            System.out.println("Collection : " + vector);             // getting the synchronized view of Collection            Collection<Integer> c = Collections                                        .synchronizedCollection(vector);             // printing the Collection            System.out.println("Synchronized view is : " + c);        }         catch (IllegalArgumentException e) {            System.out.println("Exception thrown : " + e);        }    }}
Collection : [20, 30, 40, 50, 60]
Synchronized view is : [20, 30, 40, 50, 60]
 
anikakapoor
ruhelaa48
Java - util package
Java-Collections
Java-Functions
Java
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Java-Collections
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