structure
Class SkewHeap

java.lang.Object
  structure.SkewHeap

All Implemented Interfaces:

PriorityQueue

public class SkewHeap
extends Object
implements PriorityQueue

An implementation of a priority queue using skew heaps. Skew heaps allow one to construct heaps dynamically without explictly balancing the heaps. Main operation is a merge.

Constructor Summary

SkewHeap()
Constructs an empty priority queue.

Method Summary

void	add(Comparable value) Add a value to the priority queue.
void	clear() Remove all the elements from the queue.
Comparable	getFirst() Fetch lowest valued (highest priority) item from queue.
boolean	isEmpty() Determine if the queue is empty.
Comparable	remove() Returns the minimum value from the queue.
int	size() Determine the size of the queue.
String	toString() Construct a string representation of the heap.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SkewHeap

public SkewHeap()

Constructs an empty priority queue.

Method Detail

getFirst

public Comparable getFirst()

Fetch lowest valued (highest priority) item from queue.

Specified by:

getFirst in interface PriorityQueue

Returns:

The smallest value from queue.

remove

public Comparable remove()

Returns the minimum value from the queue.

Specified by:

remove in interface PriorityQueue

Returns:

The minimum value in the queue.

add

public void add(Comparable value)

Add a value to the priority queue.

Specified by:

add in interface PriorityQueue

Parameters:

value - The value to be added.

size

public int size()

Determine the size of the queue.

Specified by:

size in interface PriorityQueue

Returns:

The number of elements within the queue.

clear

public void clear()

Remove all the elements from the queue.

Specified by:

clear in interface PriorityQueue

isEmpty

public boolean isEmpty()

Determine if the queue is empty.

Specified by:

isEmpty in interface PriorityQueue

Returns:

True if the queue is empty.

toString

public String toString()

Construct a string representation of the heap.

Overrides:

toString in class Object

Returns:

The string representing the heap.