Program: Write an example for Collections.asLifoQueue() method.

The Collections.asLifoQueue() method returns a view of a Deque as a Last-in-first-out (Lifo) Queue. Method add is mapped to push, remove is mapped to pop and so on. This view can be useful when you would like to use a method requiring a Queue but you need Lifo ordering.

package com.java2novice.collections;

import java.util.ArrayDeque;
import java.util.Collections;
import java.util.Deque;
import java.util.Queue;

public class CollectionAsLifoQueue {

	public static void main(String args[]) {
	       
	      Deque<String> dq = new ArrayDeque<String>(5);
	      dq.add("java");
	      dq.add("c");
	      dq.add("c++");
	      dq.add("unix");
	      dq.add("perl");        
	      Queue<String> q = Collections.asLifoQueue(dq);   
	      System.out.println("returned queue is: "+q);
	   } 
}

returned queue is: [java, c, c++, unix, perl]