Class Pile

java.lang.Object
  |
  +--Pile

public class Pile

extends java.lang.Object

Constructor Summary

Pile()
Creates a new empty pile.

Method Summary

void	addDisk(Disk disk) adds a new disk onto the top of the pile.
int	getNumberOfDisks() returns the number of disks on the pile.
boolean	isEmpty() returns true if the pile is empty, false otherwise.
Disk	removeDisk() removes the first disk on the pile if exists and returns it.
Disk	topDisk() returns the top disk on the pile without removing it from the pile.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Pile

public Pile()

Creates a new empty pile.

Method Detail

getNumberOfDisks

public final int getNumberOfDisks()

returns the number of disks on the pile.

Returns:

the number of disks on the pile.

removeDisk

public Disk removeDisk()

removes the first disk on the pile if exists and returns it.

Returns:

the first disk on the pile, if exists.

addDisk

public void addDisk(Disk disk)

adds a new disk onto the top of the pile.

Parameters:

disk - the disk to be added onto the top of the pile.

topDisk

public Disk topDisk()

returns the top disk on the pile without removing it from the pile.

Returns:

the top disk on the pile.

isEmpty

public boolean isEmpty()

returns true if the pile is empty, false otherwise.

Returns:

true if the pile is empty, false otherwise.