1

Greenfoot

imacat@mail.imacat.idv.tw2012/6/15

CC Attribution-ShareAlike 3.0 Unported

(Method)

class UnflippedPile{ public void flipNextCard() { }}

class FlippedPile{ public void returnAllCards() { } public void moveToWorking() { } public void moveToResult() { }}

class WorkingPile{ public void moveToWorking() { } public void moveToResult() { }}

class ResultPile{ public void moveToWorking() { } public void moveToResult() { }}

methodmethodmethod

flipNextCard()

takeTopCard()

turnFaceUp()

addCard(Card card)

Table table = (Table) getWorld()

getWorld()UnflippedPileActorWorld

getWorld()UnflippedPileActorWorld

TableflippedPileaddCardflippedPileTableWorld

JavaWorldflippedPileTableflippedPile

type casting

(Table) getWorld()Cfloat pi = 3.1415926;

int p = (int) pi;

World world = table;

card.pile = unflippedPile;

Pile pile = unflippedPile;

Table table = (Table) getWorld();

FlippedPile pile = (FlippedPile) unflippedPile;

Card card = (Card) pile;

Table table = (Table) card;

WorldTable

ActorTableActorgetWorld()WorldTable

flipNextCard()

** * */public class UnflippedPile extends Pile{ /** * */ public void flipNextCard() { Table table = (Table) getWorld(); Card card = takeTopCard(); card.turnFaceUp(); table.flippedPile.addCard(card); }}

returnAllCards()

takeTopCard()

turnFaceDown()

addCard(Card newCard)

returnAllCards()

returnAllCards()

/** * */public class FlippedPile extends Pile{ /** * */ public void returnAllCards() { Table table = (Table) getWorld(); while (getSize() > 0) { Card card = takeTopCard(); card.turnFaceDown(); table.getUnflippedPile().addCard(card); } }}

solitaire-2

moveToWorking()moveToResult()