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Queue poll() method example in Java
Fetch and remove the first element in Queue using the poll() method.
Create a queue −
Queue<String> q = new LinkedList<String>();
Add some elements −
q.add("abc");
q.add("def");
q.add("ghi");
q.add("jkl");
q.add("mno");
q.add("pqr");
q.add("stu");
q.add("vwx");Now, remove the first element −
q.poll()
The following is an example to implement the poll() method −
Example
import java.util.LinkedList;
import java.util.Queue;
public class Demo {
public static void main(String[] args) {
Queue<String> q = new LinkedList<String>();
q.add("abc");
q.add("def");
q.add("ghi");
q.add("jkl");
q.add("mno");
q.add("pqr");
q.add("stu");
q.add("vwx");
System.out.println("Queue head = " + q.element());
System.out.println("Removing element from queue = " + q.poll());
System.out.println("Queue head now = " + q.element());
System.out.println("Removing element from queue = " + q.poll());
System.out.println("Queue head now = " + q.element());
System.out.println("
Remaining Queue elements...");
Object ob;
while ((ob = q.poll()) != null) {
System.out.println(ob);
}
}
}Output
Queue head = abc Removing element from queue = abc Queue head now = def Removing element from queue = def Queue head now = ghi Remaining Queue elements... ghi jkl mno pqr stu vwx
Updated on: 25-Jun-2020
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