Collections synchronizedCollection() method in Java with Examples
Last Updated :
08 Jul, 2021
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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() method
Example 1:
// 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);
}
}
}
Output
Collection : [A, B, C, D, E] Synchronized view of collection : [A, B, C, D, E]
Example 2:
// 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);
}
}
}
Output:
Collection : [20, 30, 40, 50, 60] Synchronized view is : [20, 30, 40, 50, 60]
