JAVA

Deque interface in Java

// Java program to demonstrate the working
// of a Deque in Java
 
import java.util.*;
 
public class DequeExample {
    public static void main(String[] args)
    {
        Deque<String> deque
            = new LinkedList<String>();
 
        // We can add elements to the queue
        // in various ways
 
        // Add at the last
        deque.add("Element 1 (Tail)");
 
        // Add at the first
        deque.addFirst("Element 2 (Head)");
 
        // Add at the last
        deque.addLast("Element 3 (Tail)");
 
        // Add at the first
        deque.push("Element 4 (Head)");
 
        // Add at the last
        deque.offer("Element 5 (Tail)");
 
        // Add at the first
        deque.offerFirst("Element 6 (Head)");
 
        System.out.println(deque + "
");
 
        // We can remove the first element
        // or the last element.
        deque.removeFirst();
        deque.removeLast();
        System.out.println("Deque after removing "
                           + "first and last: "
                           + deque);
    }
}