Queue Implementations - Java Pt. 4

/*
* Purpose: to create an interface with the group of Queue methods
*/

public interface Queue{

public boolean isEmpty(); //checks if the queue is empty
public boolean add(Object o); //places an object at the end of the queue
public Object peek(); //returns the value at the front of the queue
public Object remove(); //removes and returns the value at the front of the queue

}//end Queue interface

You will also need a Listnode.java class which can be found by following the link below.
http://www.associatedcontent.com/article/2636363/linked_list_implementation_java_pt.html?cat=15