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/**
* An interface contains a set of methods that must be implemented.
* It is a way to ensure that the class that implements it
* has all the necessary components.
*
* If a class wishes to implement the Queue interface, it must
* have all the methods fully implemented.
*
* Below is an example of a Queue interface. (Full implementation can be
* seen in the ArrayQueue class)
*/
public interface Queue {
/**
* Enqueues o to the queue.
* Precondition: isFull() returns false.
*/
void add(Object o);
/**
* Remove and return the front element.
* Precondition: size() != 0
*/
Object remove();
// Return the size of the queue
int size();
// Return whether the queue is full or not
boolean isFull();
// Return whether the queue is empty or not
boolean isEmpty();
}
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