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package rd222dv_assign4;
import java.util.Iterator;
public interface Queue <T> { //same interface as in assign2, only Object was replaced with T
public int size(); // current queue size
public boolean isEmpty(); // true if queue is empty
public void enqueue(T element); // add element at end of queue
public T dequeue(); // return and remove first element.
public T first(); // return (without removing) first element
public T last(); // return (without removing) last element
public String toString(); // return a string representation of the queue content
public Iterator <T> iterator(); // element iterator
} |