ConcurrentLinkedQueue iterator() method in Java
Last Updated :
26 Nov, 2018
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The iterator() method of ConcurrentLinkedQueue is used to returns an iterator of the same elements as this ConcurrentLinkedQueue in a proper sequence. The elements returned from this method contains elements in order from first(head) to last(tail). The returned iterator is weakly consistent.
Syntax:
Java
Java
public Iterator iterator()Returns: This method returns the iterator having same elements as present in ConcurrentLinkedQueue in Proper Sequence. Below programs illustrate iterator() method of ConcurrentLinkedQueue: Example 1:
// Java Program Demonstrate iterator()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<String>
queue = new ConcurrentLinkedQueue<String>();
// Add String to queue
queue.add("Aman");
queue.add("Amar");
queue.add("Sanjeet");
queue.add("Rabi");
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue :\n" + queue);
// Call iterator() method
Iterator iterator = queue.iterator();
// Print elements of iterator
System.out.println("\nThe String Values of iterator are:");
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
}
}
Output:
Example 2:
ConcurrentLinkedQueue : [Aman, Amar, Sanjeet, Rabi] The String Values of iterator are: Aman Amar Sanjeet Rabi
// Java Program Demonstrate iterator()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<Integer>
queue = new ConcurrentLinkedQueue<Integer>();
// Add Numbers to queue
queue.add(4353);
queue.add(7824);
queue.add(78249);
queue.add(8724);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
// Call iterator() method
Iterator values = queue.iterator();
// Print elements of iterator
System.out.println("\nThe Numbers of iterator are:");
while (values.hasNext()) {
System.out.println(values.next());
}
}
}
Output:
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedQueue.html#iterator--
ConcurrentLinkedQueue: [4353, 7824, 78249, 8724] The Numbers of iterator are: 4353 7824 78249 8724
