package devmanuals.com;

import java.util.Deque;
import java.util.LinkedList;
import java.util.Iterator;

public class DequePeekFirst {
	public static void main(String args[]) {
		Deque<String> dq = new LinkedList<String>();
		dq.add("11");
		dq.add("DEV");
		dq.add("MANUALS");
		System.out.println("Is Deque empty : " + dq.isEmpty());
		System.out.println("Elements of deque = " + dq);
		System.out.println("Size of deque : " + dq.size());
		Object obj = dq.peekFirst();
		System.out.println("Head element = " + obj);
		Iterator iq = dq.iterator();
		while (iq.hasNext()) {
			dq.remove();
		}
		System.out.println("Is Deque empty : " + dq.isEmpty());
		// Here the implementation of peekFirst() method will display null
		System.out.println("Therefore returns " +"'"+ dq.peekFirst()+"'");
	}
}