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/**

* A small queue interface. You can query the size of the queue and

* ask whether it is empty, add and remove items, and peek at the front

* item.

*/

public interface Queue {

/**

* Adds the given item to the rear of the queue.

*/

void enqueue(Object item);

/**

* Removes the front item from the queue and returns it.

* @exception java.util.NoSuchElementException if the queue is empty.

*/

Object dequeue();

/**

* Returns the front item from the queue without popping it.

* @exception java.util.NoSuchElementException if the queue is empty.

*/

Object peek();

/**

* Returns the number of items currently in the queue.

*/

int size();

/**

* Returns whether the queue is empty or not.

*/

boolean isEmpty();

}