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Dequeue Interface

Remarks:

Generics can be used with Deque.

Deque<Object> deque = new LinkedList<Object>();

When a deque is used as a queue, FIFO (First-In-First-Out) behavior results.

Deques can also be used as LIFO (Last-In-First-Out) stacks.

For more information about methods, go through this Documentation.

Adding Elements to Deque

Deque deque = new LinkedList();

//Adding element at tail
deque.add("Item1");

//Adding element at head 
deque.addFirst("Item2");

//Adding element at tail 
deque.addLast("Item3");

Removing Elements from Deque

//Retrieves and removes the head of the queue represented by this deque
Object headItem = deque.remove();

//Retrieves and removes the first element of this deque.
Object firstItem = deque.removeFirst();

//Retrieves and removes the last element of this deque.
Object lastItem = deque.removeLast();

Retrieving Element without Removing

//Retrieves, but does not remove, the head of the queue represented by this deque
Object headItem = deque.element();

//Retrieves, but does not remove, the first element of this deque.
Object firstItem = deque.getFirst();

//Retrieves, but does not remove, the last element of this deque.    
Object lastItem  = deque.getLast();

Iterating through Deque

//Using Iterator
Iterator iterator = deque.iterator();
while(iterator.hasNext(){
  String Item = (String) iterator.next();
}

//Using For Loop
for(Object object : deque) {
    String Item = (String) object;
}

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