The world class compiles fine. However when i do compile it the card class opens up showing syntax errors.
JollyGreenGiant wrote ...
2020/4/26
How do i make a simple memory card game?
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Card here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Card extends Actor
{
private static GreenfootImage back = new GreenfootImage("cover.gif");
private static Card firstPicked;
public static int matchTries;
public static int matchCount;
private GreenfootImage front;
private boolean showing;
private int value;
public Card(String fname, int val)
{
value = val;
front = new GreenfootImage(fname+".gif");
setImage(back);
}
public void showCard()
{
if (showing)
System.out.print(String.format("%10s",back));
else
System.out.print(String.format("%10s","["+front+"]"));
}
public void SetShowingStatus()
{
if(showing)
showing = false;
else
showing = true;
}
private void flipCard()
{
showing = ! showing;
setImage(showing ? front : back);
}
public void firstClicked()
{
this.flip();
Greenfoot.delay(40);
if (firstClicked == null)
{
firstClicked = this;
}
else
{
String image1 = firstClicked.getImage().toString().substring(17);;
image1 = image1.substring(0, image1.indexOf(" "));
String image2 = this.getImage().toString().substring(17);;
image2 = image2.substring(0, image2.indexOf(" "));
if (image1.equals(image2))
{
Greenfoot.playSound("fanfare.wav"); // example code
addObject(new Correct(), getX(), getY()+100); // or wherever
}
else
{
Greenfoot.playSound("wrong.wav"); // example code
firstClicked.flip();
this.flip();
}
firstClicked = null;
}
}
private void flip()
{
imageIndex = (imageIndex+1)%2;
setImage(images[imageIndex]);
}
public void ifCorrect()
{
if((card1Flipped == true) && (card2Flipped == true))
{
Greenfoot.delay(30);
displayCorrect();
getWorld().removeObjects(getWorld().getObjects(Card2.class));
getImage().setTransparency(0);
}
else if((card3Flipped == true) && (card4Flipped == true))
{
Greenfoot.delay(30);
displayCorrect();
getWorld().removeObjects(getWorld().getObjects(Card3.class));
getWorld().removeObjects(getWorld().getObjects(Card4.class));
}
else
{
flipBack();
}
if (secondCard == null)
{
Cards card = pickedCard();
if (firstCard == null)
{
firstCard = card;
}
else
{
secondCard = card;
if (firstCardImage().equals(secondCardImage()))
{
correctSequence = true;
initializeCorrectSequence();
}
else
{
wrongSequence = true;
initializeWrongSequence();
}
}
}
else
{
if (wrongSequence)
{
performWrongSequenceStep();
if (lastWrongsequenceStep())
{
wrongSequence = false;
firstCard = null;
secondCard = null;
}
}
else if (correctSequence)
{
performCorrectSequenceStep();
if (lastCorrectSequenceStep())
{
correctSequence = false;
firstCard = null;
secondCard = null;
}
}
}
}
}
Btw the way thank you so much for helping me, I wouldn't even be close to a solution if you wasn't for your help.
You have a lot of game control code in your Card class that should be in your world class. My last 3 code posts near the bottom of page 2 of this discussion is ALL you need in your Card class. In fact, the static fields should be in your world class instead of the Card class. Once that is done, all that needs worked on is the act method of your world class.
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Card here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Card extends Actor
{
private static GreenfootImage back = new GreenfootImage("cover.gif");
private static Card firstPicked;
public static int matchTries;
public static int matchCount;
private GreenfootImage front;
private boolean showing;
private int value;
private void flipCard()
{
showing = ! showing;
setImage(showing ? front : back);
}
} import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot, and MouseInfo)
/**
* Write a description of class MemoryGame here.
*
* Andy McCallum
* 01/05/2020
*/
public class MemoryGame extends World
{
Card[] cards = new Card[20];
public MemoryGame()
{
super(5, 4, 100);
// load array
// shuffle
// deal
for (int i=0; i<cards.length; i++) cards[i] = new Card("g"+(i/2), i/2);
java.util.Collections.shuffle(java.util.Arrays.asList(cards));
for (int i=0; i<cards.length; i++) addObject(cards[i], i/5, i%5);
private static GreenfootImage back = new GreenfootImage("cover.gif");
private static Card firstPicked;
public static int matchTries;
public static int matchCount;
private GreenfootImage front;
private boolean showing;
private int value;
}
public Card(String fname, int val)
{
value = val;
front = new GreenfootImage(fname+".gif");
setImage(back);
}
public void showCard()
{
if (showing)
System.out.print(String.format("%10s",back));
else
System.out.print(String.format("%10s","["+front+"]"));
}
public void SetShowingStatus()
{
if(showing)
showing = false;
else
showing = true;
}
private void flipCard()
{
showing = ! showing;
setImage(showing ? front : back);
}
public void firstClicked()
{
this.flip();
Greenfoot.delay(40);
if (firstClicked == null)
{
firstClicked = this;
}
else
{
String image1 = firstClicked.getImage().toString().substring(17);;
image1 = image1.substring(0, image1.indexOf(" "));
String image2 = this.getImage().toString().substring(17);;
image2 = image2.substring(0, image2.indexOf(" "));
if (image1.equals(image2))
{
Greenfoot.playSound("fanfare.wav"); // example code
addObject(new Correct(), getX(), getY()+100); // or wherever
}
else
{
Greenfoot.playSound("wrong.wav"); // example code
firstClicked.flip();
this.flip();
}
firstClicked = null;
}
}
private void flip()
{
imageIndex = (imageIndex+1)%2;
setImage(images[imageIndex]);
}
public void ifCorrect()
{
if((card1Flipped == true) && (card2Flipped == true))
{
Greenfoot.delay(30);
displayCorrect();
getWorld().removeObjects(getWorld().getObjects(Card2.class));
getImage().setTransparency(0);
}
else if((card3Flipped == true) && (card4Flipped == true))
{
Greenfoot.delay(30);
displayCorrect();
getWorld().removeObjects(getWorld().getObjects(Card3.class));
getWorld().removeObjects(getWorld().getObjects(Card4.class));
}
else
{
flipBack();
}
if (secondCard == null)
{
Cards card = pickedCard();
if (firstCard == null)
{
firstCard = card;
}
else
{
secondCard = card;
if (firstCardImage().equals(secondCardImage()))
{
correctSequence = true;
initializeCorrectSequence();
}
else
{
wrongSequence = true;
initializeWrongSequence();
}
}
}
else
{
if (wrongSequence)
{
performWrongSequenceStep();
if (lastWrongsequenceStep())
{
wrongSequence = false;
firstCard = null;
secondCard = null;
}
}
else if (correctSequence)
{
performCorrectSequenceStep();
if (lastCorrectSequenceStep())
{
correctSequence = false;
firstCard = null;
secondCard = null;
}
}
}
}
}
Hi Dan, could you point out which lines in the world class I need to remove/change, thanks.
JollyGreenGiant wrote...
Hi Dan, could you point out which lines in the world class I need to remove/change, thanks.public void getValue()
{
return value;
} import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot, and MouseInfo)
/**
* Write a description of class MemoryGame here.
*
* Andy McCallum
* 01/05/2020
*/
public class MemoryGame extends World
{
Card[] cards = new Card[20];
private static Card firstPicked;
public static int matchTries;
public static int matchCount;
public MemoryGame()
{
super(5, 4, 100);
// load array
// shuffle
// deal
for (int i=0; i<cards.length; i++) cards[i] = new Card("g"+(i/2), i/2);
java.util.Collections.shuffle(java.util.Arrays.asList(cards));
for (int i=0; i<cards.length; i++) addObject(cards[i], i/5, i%5);
}
}
public static int matchTries;
public static int matchCountIm having errors with these two lines of code.
illegal character: '\u00a0' This is what shows in the syntax errors
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Card here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Card extends Actor
{
private static GreenfootImage back = new GreenfootImage("cover.gif");
private GreenfootImage front;
private boolean showing;
private int value;
private void flipCard()
{
showing = ! showing;
setImage(showing ? front : back);
}
public void getValue()
{
return value;
}
}On line 26 of the card class, it has a syntax error saying: incompatible types: unexpected return value
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