Java collection Queue Example

Java collection Queue Example

How can we use Queue in java collection?

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June 23, 2012 at 6:48 PM

import java.util.LinkedList;
import java.util.Queue;

public class MainDemo {

    public void queueExample() {

        Queue queue = new LinkedList();

        queue.add("Java");
        queue.add("DotNet");

        queue.offer("PHP");
        queue.offer("HTML");

        System.out.println("remove: " + queue.remove());
        System.out.println("element: " + queue.element());
        System.out.println("poll: " + queue.poll());
        System.out.println("peek: " + queue.peek());

    }

    public static void main(String[] args) {
        new MainDemo().queueExample();
    }
}

Output:-

remove: Java
element: DotNet
poll: DotNet
peek: PHP

Description:- In the above code, we have implemented Queue by its subclass LinkedList.We have created a method QueueExample.Using the add()and offer() method, we have added elements to LinkedList. Then, we have used remove() and poll() methods to remove elements.

element(): This method retrieves the head of the queue.

offer(E o): This inserts the specified element into the queue.

peek(): This method retrieves the head of this queue, returning null if this queue is empty.

poll(): This method retrieves and removes the head of this queue, or return null if this queue is empty.

remove(): This method retrieves and removes the head of this queue.









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