I hope I'm making myself clear with the problem. If not, tell me, I will try te explain it better.

John

Well, when you flip and expose the first card you need to keep a record of that card: you can just create a single global variable of type 'Card' to hold this - let's call it 'firstCard'.  In mouseClicked assign the first card clicked to firstCard and when a second card is clicked just set firstCard = null; that way you can just test if it's null and always know when a first card is being drawn:

Code:

void mouseClicked() {
   for(int i=0; i<nrOfCards; i++)  {
     // note I've used some shorthand here
     if(card[i].inside(mouseX,mouseY) && !card[i].exposed){
       card[i].setExposed(true);
       card[i].setPlaying(true);
       
       // the first card is drawn
       if(firstCard == null){
         // keep a record of the first card
         firstCard = card[i];
       }
       // now a second card is drawn...
       else {
           // check that the sounds match and act accordingly
           // ...

           // reset firstCard:
         firstCard = null;
       }
} 

Since firstCard is a reference to a Card object you can access all the card's properties from it...  However this is where you run into problems, as currently you don't seem to have any way of identifying matching pairs.  At first I assumed that they'd have matching filenames, but they don't...  (Which seems odd as this isn't an efficient way to reduce filesize!)  So that's something you're going to have to address - either as an added property of the class or possibly at a global level.

I'd personally ditch the code that turns the card back over when it's clicked a second time.  That confuses the issue and in terms of feedback for failure it's easier to just flip the card back automatically (though you may need to write a new method that lets the associated music play for a set amount of time before stopping).

Hopefully that's enough to get you back on track...

I'm surprised - you've managed to create a class and add some general functionality, but you don't follow the addition of a simple condition?

Let me explain it a bit further.  When you create the 'firstCard' variable you don't assign it a value; so it returns 'null'.  So when the mouse is pressed over a card you can test if firstCard == null and you know this is the first card to be clicked on.  So you then store the Card that was clicked on in the 'firstCard' variable...

Now the next time you click on the card, firstCard is no longer null so you go to the 'else' part of the condition.  You now have a reference to the first card clicked and the second card clicked so you can then test an appropriate property for each card to see if the match and reset firstCard to null so a new pait of cards can be clicked on...

As I suggested before the most suitable property to compare would be the file name.  I'd find another way to set the this when creating the card objects.  Probably the simplest option would be to create an array of file names and make sure each audio file is referenced twice within the array.  You could then run a shuffle routine on the array to ensure the position of the cards is different each time...

If you're still struglling I can post working code; but since this could well be homework I'm loath to hand you the answer on a plate.  Have a go at implementing my suggestions and post your code here (no need to include the audio files for general questions)...

i exactly know what you mean..I have no clue what i hacked in there a week ago..but it's funny