// collections/QueueDemo.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Upcasting to a Queue from a LinkedList

import java.util.*;

public class QueueDemo {

public static void printQ(Queue queue) {

while(queue.peek() != null)

System.out.print(queue.remove() + " ");

System.out.println();

}

public static void main(String[] args) {

Queue<Integer> queue = new LinkedList<>();

Random rand = new Random(47);

for(int i = 0; i < 10; i++)

queue.offer(rand.nextInt(i + 10));

printQ(queue);

Queue<Character> qc = new LinkedList<>();

for(char c : "Brontosaurus".toCharArray())

qc.offer(c);

printQ(qc);

}

}

/* Output:

8 1 1 1 5 14 3 1 0 1

B r o n t o s a u r u s

*/