Simple Example Program For Queue In Java

Queue Java Example Program

This page contains simple Java example programs for Queue Java Example Program with sample output. This java example program also expain the concepts for clearly.

Go to Program

Queue Wiki Definition:

In each of the cases, the customer or object at the front of the line was the first one to enter, while at the end of the line is the last to have entered. Every time a customer finishes paying for their items (or a person steps off the escalator, or the machine part is removed from the assembly line, etc.) that object leaves the queue from the front. This represents the queue “dequeue” function. Every time another object or customer enters the line to wait, they join the end of the line and represent the “enqueue” function. The queue “size” function would return the length of the line, and the “empty” function would return true only if there was nothing in the line.

Simple Example Program For Queue In Java

import java.io.IOException;
import java.util.LinkedList;
import java.util.Queue;

public class QueueExample {

    public static void main(String arg[]) throws IOException {
        Queue<Integer> q = new LinkedList<Integer>();
        
        // Add in Queue
        q.add(23);
        q.add(33);
        System.out.println(q);
        System.out.println("Queue Element :"+q.element());
        // Offer In Queue 
        q.offer(34);
        q.offer(98);
        q.offer(77);

        System.out.println(q);
        System.out.println("Queue Element :"+q.element());
        q.poll();
        System.out.println("Queue Element :"+q.element());
        System.out.println("After poll : " + q);
    }
}

Sample Output:

[23, 33]
Queue Element :23
[23, 33, 34, 98, 77]
Queue Element :23
Queue Element :33
After poll : [33, 34, 98, 77]