queueinterface.java

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package Queue;

/**
 *
 * @author Sisekelo
 * @param <T>
 */
public interface QueueInterface <T> {
    //adds object to the queue, doesnt return anything
    void enqueue(T t);

    //removes head of queue
    T dequeue();

    //checks what object is on top of queue
    T peek();

    //checks if queue is empty, returns boolean
    boolean empty();
}

This interface looks fine and I see progress with the naming convention - before I saw code where the interface name started with a lower case letter. Good.

Try to give the implementation a go, feel free to read the other gists to get an idea as to what to do.