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Interface DataStructures.Queue

public interface Queue
Protocol for queues.

Method Index

o dequeue()
Return and remove the least recently inserted item from the queue.
o enqueue(Object)
Insert a new item into the queue.
o getFront()
Get the least recently inserted item in the queue.
o isEmpty()
Test if the queue is logically empty.
o makeEmpty()
Make the queue logically empty.

Methods

o isEmpty 
  public abstract boolean isEmpty()
Test if the queue is logically empty.

Returns:
true if empty, false otherwise.
o getFront 
  public abstract Object getFront() throws Underflow
Get the least recently inserted item in the queue. Does not alter the queue.

Returns:
the least recently inserted item in the queue.
Throws: Underflow
if the queue is empty.
o dequeue 
  public abstract Object dequeue() throws Underflow
Return and remove the least recently inserted item from the queue.

Returns:
the least recently inserted item in the queue.
Throws: Underflow
if the queue is empty.
o enqueue 
  public abstract void enqueue(Object X)
Insert a new item into the queue.

Parameters:
X - the item to insert.
o makeEmpty 
  public abstract void makeEmpty()
Make the queue logically empty. 

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